I was wonderin why them Houston cats was throwin that up all the time. I thought they was doin it on some Screwed-Up click shit.
That's also the sign the Brims(Cali) throw up and the Insane Unknown Kings(Chi) throw it up for the letter "U" http://www.chicagomobs.org/insaneunkowns.htm(They spelled UNKNOWN wrong)
Tech N9ne and them throw that up too.