Definitions
Wiktionary
- n. as much as a mug will contain
GNU Webster's 1913
- n. the quantity that can be held in a mug.
WordNet 3.0
- n. the quantity that can be held in a mug
Etymologies
- mug + -ful (Wiktionary)
Examples
“Tip: Make the sugar syrup by putting equal quantities of sugar and water in a saucepan (say half a mugful ofeach) and leaving it over a very low heat until all the grains of sugar have dissolved.”
“When it was ready, she poured a mugful, took a deep breath, and brought it out to Nick.”
“Hush Supper Club founder Geeta serves a mugful of aromatherapy that happens to taste divine.”
“At home, I usually put my leaves into the infuser of the iced tea machine and when I want hot tea, I just zap a mugful.”
“I got dressed, staggered out to the kitchen, poured myself a mugful of black coffee, and took it into the living room.”
““It is,” said J.W. He poured himself a mugful of coffee.”
““Just coffee,” Ian said, and helped himself to a mugful.”
“She poured a mugful from a stainless steel server.”
“She has a big mugful, into which she mixes a packet of hot chocolate mix.”
“With a mugful of water at a time we rinsed from our heads and upper bodies some of the accumulated sand and dust of the six-and-a-half days of travail.”
Tweets
Looking for tweets for mugful.

yarb Obviously a measure of liquid quantity. But this would also make a good adjective applicable to people and animals. It could mean something like "happily dumb" or "stupid but eager to please". E.g. "Oscar nodded mugfully when his mother-in-law asked him if he liked Stravinsky." Nov 8, 2007