1. The bulge in Siwon's pants.
2. Siwon's dick.

(Choi Siwon, more commonly referred to as Siwon, is a member of Korean boyband, Super Junior.)
Fan 1: Look at that SiBulge!
Fan 2: I know, that's probably why he's called 'Horse'.
by parkpark November 05, 2011

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