Italian slang. It's a mix between latin and italian. "ad" means forward in latin, while cazzo means "dick" in italian. However the both together have a whole different meaning; it is used to say "randomly".
A: "How are you choosing this?"
B: "Ad cazzum"

C: "How are you gonna do this?"
D: "Ad cazzum"
by ci_c2 November 6, 2015
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