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Similar to cameltoe and mooseknuckle but instead of the bulge being in the front of the pelvis, the Willy is stuck to the thigh which gives off the impression of an enormous willy.
Marc: Yo how'd your date go last night bro!
Seb: It was ight she totally saw my side Willy when I stood up from the table
Marc: Yasssss dude I love when I see other people's side Willy's
Seb: what!!?!?!
by Side Willy June 09, 2017
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