I found this video amusing:
YouTube - Hugh Laurie: the British accent vs the American
Hugh Laurie and Ellen Degeneres take it turns to see how much of British/American slang the other knows.
I've run through the comments and found out most British/American people don't use those slang words much. However, one might find it good to be aware of their existence :)
P.S. I especially liked "chuffed to bits by your ba-donka-donk"