Rottainculo is an italian word that means you have been butt fucked so many times that you have a broken ass hole. So when they tell you you are a rottainculo or rotta in culo, it will mean you have a broken ass hole.
"Sei proprio un frocio rottoinculo" (you are a fag with a broken ass hole)

"Quella puttana si è scopata mezza scuola"
"È proprio una rottainculo" ("that whore fucked half school" "she is such a bitch with a broken ass hole")
by abeyance/Giovanni C. March 3, 2014
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