An annoying person who takes jokes to far and purposelly pisses people off for their own amusement. They also laugh at their own jokes when no one else does.
"What the hell you killed it damn leemer"
by Jewcob May 25, 2005
US military slang: A shot of cold urine to the heart.
"Those tailpipes in our windscreen," Flap said, sighing. "Man, that was a leemer".
by bthylafh November 10, 2010