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1.
Adj - To go a bit mad, crazy or wacky.
As in;

"Last time my mate Gavin drank Stella, he went completely yampy!"

"Claire; dont get a Zen ipod thing -within months mine went yampy."

"What the hell is Rooney doing?? He's gone yampy!"
by -=Matt=- November 02, 2005
 
2.
black country for soft or mental ya can also call someone a "yamp", sometimes people joke about you being a "yampy yam yam"

ya can also call someone a yampy bleeder
johnny: yowm yampy yo am
local nutcase: I aye
johnny: yo am yam mental
johnny: yam a right yamp
by bluefunk September 27, 2005
 
3.
U.K back country midlands slang for someone a bit over the top and retarded, someone with a backwards mentality,
did ya see that last night on tv, them right yamps on the jerry springer show aye they

are yome a yampy get n' all, yove bin watchin it too long, thats the matter with yo maytey
by Paul John from the midlands August 12, 2005
 
4.
having far too much manic energy
all ferretts are by nature yampy
by bud June 06, 2003
 
5.
(YAM-pee, adj.) -The pessimistic feeling or sensation of a certain lacking or withdrawal, usually originating from long periods of time with little to no intimate contact with the opposite sex.
Having not kissed a girl for several months has left the Brad quite yampy of late.
by blueduke89 February 21, 2013
 
6.
During my Egyptian Canal Zone RAF service 1953-55. I think it was used mainly by Midlanders and Northerners.
A mild insult but exactly what it meant then I cannot now say.
"You're yampy you are".
by Alan Merryweather October 06, 2006
 
7.
Mouthy, lower class, mouthy, unwashed, mouthy, overweight, mouthy, female. Usually, but not always, a pikey.
"she was a right yampy bitch"
"...there she was, yamping on about her dog..."
by Oddstream March 02, 2005