Blue Back

When you take a shit in a port-a-let and the blue chemical water splashes back up on you staining your ass and your back.

The frustration experienced as a result of a backrub stopped too soon, especially when the backrub giver never intended to follow through with the backrub in the first place. A phenomenon similar to, but less severe than, blue balls.

When someone starts to give you a backrub, then leaves abruptly, leaving you unsatisfied.

An extended, often elaborate array of male-on-female foreplay that fails to end in copulation. The common opening move is for the man to offer the woman a back rub, followed by a series of maneuvers that may or may not include a leg massage, teasing of the upper ass around the pantyline, a slight grazing of the sideboob, and as a last resort some aggressively handsy spooning. Crippling, fetal-position blue balls often results, remedied only by vigorous, albeit lonely and pathetic masturbation.

It means to peel someone's cap back....as in take their fucking head off in a fight.

When you tell a nigga you gone peel his muffin cap back blue, that means his pussy stank!

the art or cutting a mans dickhead off, preferable with a prison shank seeing how that where this saying came from