Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Being in a format such that listeners or viewers are invited to have their telephone conversations with the host or guests on a show broadcast to other listeners: a call-in radio show.
- n. A viewer's or listener's telephone conversation with or telephone call to the host of such a show.
- n. A viewer or listener making such a call.
Wiktionary
- adj. of a radio programme In which members of the public telephone the studio and talk live to the presenter.
- n. Such a radio programme
- n. Such a call
- n. Such a caller
WordNet 3.0
- n. a telephone call to a radio station or a television station in which the caller participates in the on-going program
Examples
“It's what Dr. Laura would say if she had a call-in show devoted to academic economists.”
Tyler: A Plague on Both Your Houses, Bryan Caplan | EconLog | Library of Economics and Liberty
“But before, when I was in Kansas, I would listen to Christian call-in stations because it was all I could get on the radio.”
The Washington Post: David Sedaris, sharing his slights-of-life tales
“Sheen's media blitz Monday also included a 40-minute interview from his backyard with celebrity website TMZ, a call-in to Fox Sports Radio's Loose Cannons program and a surprise stop at CNN's Piers Morgan Tonight, on which Sheen said he's on a quest to claim absolute victory across the board on every front in this whole mess.”
“That would at least explain his most recent flip-flop: during a call-in interview on Monday's Fox & Friends, Trump revealed that, despite indicating otherwise, he still may run for president in 2012.”
“Although I was a call-in guest on the same show, he casually reduced my work to the “notion that Obama uses the word eyes a lot.””
“Chris Christie, on a radio call-in show in Philadelphia, was asked again this week if he's tired of being asked if he'll run for president.”
“I think he finally went off around 8 PM, just when the night show, a tech call-in, began.”
The Huffington Post: Francine Hardaway: Death, Steve Jobs and Social Media
“The Indianapolis-based company was co-founded in 1995 by then 22-year-old Angie Hicks as a call-in review service answered by Ms. Hicks herself.”
The Wall Street Journal: At Angie's List, Journey To Market Took 16 Years
“We look forward to listener call-in questions, dealing with relationships, intimacy, family, and friendships, at 1.800.555.5453.”
The Huffington Post: Dr. Jane Greer: A Change of Will: Might Divorce Run in the Royal Family?
“Not only was our SuperFan Melissa there to show off her Eva Mendez skirt, our first (and probably only) call-in show featured a number of guests, including one that threatened the life of our dear friend Metaldy!”
Lists
These user-created lists contain the word ‘call-in’.
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Arise, Hippikins and Hippettes
A list of what are generally-accepted to be hippy words. List names derives from this quote by Germaine Greer, "To see hippikins and hippettes milling miserably around among the Mecca gorillas who ...
hippikin, hippette, groovy, split, fuzz, cool, hepcat, dig, threads, gut wadding, peace out, dude and 36 more...
Tweets
Looking for tweets for call-in.

bilby "A Washington call-in would work even better by phoning direct to homes of the big boys. For starters you can call collect the following*:
* Richard M. Nixon - El Presidente - (202) 456-1444
* Spiro T. Agnew - El Toro - (202) 265-2000 ext. 6400
* John N. Mitchell - El Butcher - (202) 965-2900
* Melvin R. Laird - El Defendo - (301) 652-4449
* Henry A. Kissinger - El Exigente - (202) 337-0042
* William P. Rogers - El Crapper - (301) 654-7125
* General Earl G. Wheeler - El Joint Bosso - (703) 527-6119
* General William C. Westmoreland - El Pollutoni - (703) 527-6999
* Richard M. Helms - El Assassin - (301) 652-4122
* John N. Chafee-El Sinko Swimmi-(703) 536-5411"
- Abbie Hoffman, 'Steal This Book', 1971. Feb 18, 2009