:Of the latinos in the town I grew up in, most are southern Mexican (not sure what it would be at now). In any case, in my early teens during the first wave of break dancing, I exclusively hung out with Latinos in my town and learned their dialect (my dialect is Salvadorean) and pinche was used as fucking (not the sexual act of). Maybe its use/meaning/vulgarity varies between regions. 

 :Examples: 
 :"¿Que le pasa a este pinche guey?" -> "What the fuck is up with this guy?" (Lit: What is wrong with this fucking guy?) 
 :"¡Sacá ese pinche carro del garage! -> "Get that fucking car out of the garage!" 
 :"¡Dame un pinche dolar!" -> "Give me a fucking dollar!" 

 :