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1.
Someone who always gets grossed out by things that many people don't get grossed out by anymore, or ever.
The opposite of a grosser is a chiller, because chillers are people who kick it and relax and don't trip.

"He's such a grosser, he can't even stand to watch Doctor 90210"

"Yeah, I got my period today."
Response: "EWWWWWWWWWWW, SHUTUPPPPPPPP"
"Gosh, stop being such a grosser, just chill."
by Mona R August 13, 2007
 
2.
More gross than gross.
Your face is grosser than your butt.
by Jaxxie September 28, 2005