I'm a fan of "shitdick", though around here the biggest insult seems to be Panzer for guys and Dargamel for hoo-ahs.

My George Carlin fave 'anyone can have bad breath, but you can knock a buzzard off a shitwagon'. RIP George
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You just want to do a scene with me, so I'll make you look straight. - Gia Jordan to Stevie Why?