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1.
noun; One who engages in the act of fully inserting testicles into his/her mouth and suckling them.
guy1:I saw Joey sucking some guy's nards the other day. He sure had a mouthful!

guy2:Wow, Joey is such a ball eater!
 
2.
Ball eater: Something that is really hard to do and usually results in failure or multiple falures
That test was a ball eater. That hydrolysis reaction ate my balls. Repairing that engine ate my balls.
de Steve Resaca 4 juillet 2010