B*B

Call me thick, if you like, but sometimes I just don't get jokes. So when my dear chum Bob came round last night, chuffed to bits and giggling like a looney about having had a 'B' tatooed on each bum cheek, I really couldn't see what all the fuss was about!
"It spells my name when I bend over." He said, demonstrating to no avail.
"Well I'm sorry," I replied "but who spells their name with an asterisk?"
Much as I hate to have to correct someone's spelling but I felt obliged to step in and make an 'O' of the offending symbol.
"There, that's better!" I opined, panting slightly.

Though I still think that SH*T might have worked better, especially after a bit of fun when his rear end would bear the legend 'SHOT'!