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1.
1. Fucked up 2. Going crazy 3. Not working properly 4. An all in all, true pain in the ass (this is the most all-encompassing and prominent definition)

Past tense: went longo

Etymology: Eastern Pennsylvania, 2004. Believed to have derived from the famous New Jersey bitch.

Can be used in any way appropriate to the situation.
Verb: I tried to log onto the computer, but it promptly crashed and now it is going longo on me.

Noun: My new boss is one hell of a Longo.
by Baxter Grimes September 14, 2004