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.
作者 Cornholio 2003年11月04日
to get an erection.
to muster the energy.
Dude, you hear Jack tried to bang his chick last night, but couldn't get it up?

I can't get it up to go shopping today.
作者 Ptorrens 2012年2月10日
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.
作者 xhottbsx 2008年3月07日

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