Green’s Dictionary of Slang

(US Mex. teen) intensifier usued in insults, the equiv. of fucking adj. (1)

1981		J. Elllroy Brown’s Requiem 111: ‘[H]e forgot to take the boxes out of the trunk, like I told him to. Pincheyputo!’.
1993		L. Rodríguez Always Running (1996) 208: Only pinche putos would tell us to back off.
2013		K. Shea ‘Having Chiqui’ in ThugLit July-Aug. [ebook] ‘Pinche cabrones,’ Luis snarled.