A person with a tendency to relate the contents of their spam messages to friends, family and co-workers - especially those with embarrassing and/or sexual content.
Gimner: "Hey, check out this spam I just got, it says 'impress your girlfriend with your schlong by rubbing our new radioactive ciarlis paste on it'... How gross is that? Yes, I know I'm phoning you at 3am mom, I just thought it was funny."
hardened fecal matter, euphemistically referred to as "bowel movement" sometimes.
gunner #1: I took a mean corn-laced gimner after I ate at Luby's yesterday.
gunner #2: I guarantee you the gimner I took was bigger. It was the derm resident of all gimners.
normal student: who gives a gimner? get a life.