What is the grammatical meaning of "pa" in Spanish?
I've heard "pa" in expressions before like "lo mandó pa´l carajo" (sent him to hell), but I've never seen it before in any of my spanish textbooks so I'm confused about its exact meaning. Gracias!

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Lovely question!  haha
"pa" is apocopate from "para" .
Vamos pallá=  Vamos para  allá. 
Vamos pal fondo = Vamos para el fondo"
Is like in English, when you say: 
I wanna learn or  wassup
Regards
María

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pa = para (used in informal speech)

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for example here in south america we cut the word ¨para¨ in  ¨pa ¨ so in that way you can talk quikly

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" lo mandó pa´l carajo"  hahaha...  yeah, this expression is some difficult to find in a textbook..

Hi Trey,
"Pa" is slang: It means "para" , but we are a little bit lazy, so we just say "pa" sometimes :)