Top Definition
to be drunk, high, and to then have sex with 20 other people of the opposite sex as you at the same time. often after having potcheen. You would think it's a very memorable experience, but very often one blanks out and forgets that it ever happened.
Guy: that was a great 21 some last night.
Girl: what 21 some?
Guy: the one where you were drunk and high and sucking on my dick!
by jadex13 November 27, 2009
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