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TWINA stands for Thumb Wrestling In Nick's Anus. As this practice becomes more commonplace, participants find that the use of the TWINA acronym is more convenient.

See also thumbwrestlinginnicksanus.
See also analthumbwrestling.
Anyone up for some TWINA?
My thumbs are sore from last night's TWINA match.
by Joey Twina August 10, 2004
Abs and Ass; Turbo chargers for successful womanizers
Massively silicon-induced trophy wife: Id like to fire up those twin A's in bed
by Salty Marmalade August 14, 2011