when u get an erection or a boner in some senses. also means to not be circumcised or a jew.
i wish my mom would help me getitup but thats just wrong cuz im not getitup.
by xhottbsx March 07, 2008
Achieve an erection; get a hard-on; by extension, perform any difficult task.
He's so asexual, he couldn't get it up at an Annie Sprinkle marathon.
by Cornholio November 04, 2003