Top Definition
'Doing a U' refers to the act of making out with someone after they have vomited at a party.
Shelly threw up from too much vodka but Andrew kissed her afterwards. Their friends were shocked. "Dude, you were totally doing a U!" they all said to Andrew.
#vomited #kissing #making out #sick #party #alcohol #getting off #doing a u
by anonymous1486 July 05, 2010
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