American Heritage Dictionary
(5)
Century Dictionary
(9)
GNU Webster's 1913
(1)
WordNet
(4)
Elsewhere on the web
American readers will know better than I whether ass is really used in the United States to mean ` sexual intercourse. '— VERBATIM: The Language Quarterly Vol VIII No 3
Ass has been looked up 751 times, favorited once, listed 27 times, and commented on once.

American Heritage Dictionary (2)
Century Dictionary (2)
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