Top Definition
The man/female covers their arm with lube the receiving partner gets in doggy style position and spreads their asscheeks the lubded one punches their anus and in one motion shoved their entire arm into the receivers anus
My ass hurts tom gave me a one-arm willy last night
#arm #live #anal #owwwww #sticky
by dookie69999 April 09, 2014
5 Words related to one-arm willy
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