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1.
When multiple boys go at it.
Or when a boy has an orgasm.
Wow... He's having a screaming boygasm.
Look at that boygasm.
by Boygasmisticerankagingdoi January 03, 2005
 
2.
What happens when a guy realizes several awesome boy things are going to happen within a short period of time.
Roland had a boygasm when he found out the Lakers and back-to-back episodes of Family Guy were on tonight.
by The deal. February 08, 2010
 
3.
When you experience something really exciting that it makes you giddy like a small child.
Taylor had a boygasm when he found out that Colin also played World of Warcraft.
by Sarah Geis April 16, 2008