Definitions by Don Murphey McMaster

Seaman's Grundle 

When two males are engaged in butt sex and one pulls out and cums all over his mates grundle.

Gay #1: Dude i'm about to bust
Gay #2: Shoot it on my grundle
Gay #1: You want a seaman's grundle?!

Seaman's Grundle by Don Murphey McMaster July 10, 2009