To have have someone, particularly an old man, excessivly squeez your arm, sholder, butt, or any body part to the point where it almost looks like molestation.
Hey man look at what Brother John is doing to Billy.
Oh man, he's been gaffed.
Gaffing Gaffed - "getting off" with somebody at a party/gathering and having sex, poking or a blow job but never speaking again. Scottish slang used mostly in Paisley and the South Side of Glasgow.