Gamp is an old-fashioned English word for an umbrella which derives from a Charles Dickens character called Mrs Gamp who used to carry an umbrella around (possibly in Martin Chuzzlewit).
Not in use today, but references can be found to it in at least 2 George Formby songs "you're everything to me" and "under that blasted oak tree".
"and although the weather's damp, i can do without my gamp"
An acronym that stands for Gay Asian Midget Porn
The network is realy slow, the guy in the next office must be downloading gamp again.
Gay anime/asian/african midget porn
ARBITOR117 likes to watch GAMP when he is not on his 360.
An amputee or otherwise physically challenged prostitute. A combination of the words "gimp" and "tramp".
Hellen Keller's ex boyfriend said she was a total gamp.
A verb meaning to be an asshole.
The kid wouldn't stop whining, so her babysitter yelled, "Quit gamping ya little bitch!"
Girl 1: If I take that dress from Primark, will it be illegal?
Girl 2: Yeah, you gamp.
Girl 1: Gamp?
Girl 2: Yeah it means stupid, retarded, get it now you gamp?