1.) Someone who is a complete jackass.
Synonyms: dill-snip dumb-ass herb
2.) Refering to someone who gargles testicles. From the slang saying, "Gargle my Balls, Bitch!".
Synonyms: fag queer
Alternative to gargalina is also gargalette, with the same 2 definitions as above.
1.) Adam's such a Gargalina! I seen him at Lippy's throwing up in the parking lot!
2.) Why you tryin to get all close, gargalina? You know I don't swing it that way!