Green’s Dictionary of Slang

ponch n.

[? the character nicknamed Ponch in the 1980s TV police show C.H.I.P.S.; Eble’s suggestion of Poncho refers in fact to the character Pancho and is thus less feasible]

(US campus) a term of address for a man.

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[US]Eble Campus Sl. Nov. 6: ponch – noun of address: Hey, Ponch. What’s up?
[US]Eble Sl. and Sociability 78: In four instances, a foreign proper name is used. Ponch, a clipping of the name of the Cisco Kid’s sidekick Poncho, is ‘a noun of address for males’; and guido means ‘macho’.