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."