When your balls erect as a result of you doing something crazy, causing you being so nervous that your testicles physically increases.
Bro 1: Hey bro, got this wild ass ballerection today.

Bro 2: No way bro, warrup?

Bro 1: I told Kathleen i want to be more than friends, my balls were as big as watermelons bro.

Bro 2: Sounds like a wild ass ballerection bro, need some ice for that bro?

Bro 1: No thanks bro, i'm good.
by ZumaZumarum January 14, 2014

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