That friend of yours who is a total cock and whatever you do to get rid of them they always come back.
I saw Jim in the pub again last night so I ran out of the back door went to the pub across the road. After ordering a pint I turned around and the cock was there smiling at me. Was a total boomerwang.
A man you used to sleep with who attempts to sleep with you again long after the relationship has ended. A boomerang wang. Can be used as a noun or a verb.
"Girl, did I tell you Matt messaged me last night? I threw that trash out last year! He's tryna boomerwang me."
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.