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1.
When your bicyle's drivetrain is so hopelessly worn out that all components have to be replaced.
I saw Wes's bike in the shop the other day, he really J- Lo'ed that chainring.

Alt definition; I was going way to fast going into that turn and J-Lo'ed into the bushes.
by The King76 September 30, 2011
 
2.
Verb. To dump. To end a relationship for the most selfish, assinine and infantile reasons.
Since Eric couldn't afford to buy Sarah the new red leather pumps she wanted, the bitch J-loed him.
by Dan January 10, 2004