to hit the horn

to take a hit of freebase cocaine from a glass pipe (aka: the horn)

Those guys scored some blow and are going to hit the horn tonight.

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hit on the horn

To make a phone call (mostly used by African Americans.)

A: "Yo... sorry I am late Bro."
B: "Yeah... I just was goin´ to hit on the horn."

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hit my horn

Call my phone

Aiight bro, hit my horn later