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2.
A phrase used to describe someone/something that is so gay that normal words dont suffice. The implication is that the person/scenario/object is comparable to being viciously rammed up the down pipe, a situation in which a mouthguard is preferable.
"That pink shirt is really mouthguard dude."
"get your stupid mouthguard dog off me, its trying to roger my drainpipes."
by Cycrowavemurry January 24, 2008
 
1.
Placing your flaccid penis into a woman's mouth and bending it in a 'U' shape like a mouth-guard.
Beth would not shut the hell up last night so I gave her a mouthguard.
by Seekerjk September 14, 2007