brothercousin 

The opposite of a cousinbrother.

Brothercousin this is your cousinbrother, lets go bowling.

brothercousin by brothercousin November 25, 2014

brothercousin 

person who you assume has mental disabilities due to genetic problems from being inbred, you assume they are simultaneously someone's brother and cousin.

'man that guy has been trying to push open that pull door for like 3 minutes.'
'he's a brothercousin, no doubt.'

brothercousin by saucebaus August 25, 2011