to listen to music, usually with noise canceling headphones (jump offs), and focus on the music while ignoring everything else around you. non casual music listening, really getting into the music, not done while working or partying

All these other definitions are wrong. The REAL definition is:

(n.) a girl who used to be obsessed with you, but somehow you(either by ignoring her, telling her off, fucking her friend, etc.) got her to "jump off" your dick. Usually happens when you realize she has a disease, she's crazy, or super ugly.

Where the expressway turns into the regular streets again.

a dick sucking hoe is a jump off.

a crack pipe, usually one of those 4" glass tubes with a fake rose inside sold in urban convenience stores as a novelty

a bitch who has sex for money and jumps off one dick to another for more money.

what all the people (who think replacing the 's' with a 'z' in or at the end of words makes them sound cooler) should do.