"Pulled It Right Out (of) My Ass" -- Describes a number or statistic that either you made up on the spot (presumably based on experience) or can't be bothered to make a careful study of to determine a more accurate value.
We were running out of time to finish the estimate and certain vendors weren't getting back to us, so we put some PIROMA prices in a few spots and we'll cover the difference with change orders.
v. To inflict trauma before, during, after, and/or about junior or senior high school prom.
- to be the victim of such horrible trauma.
Greg: Dude, did you see Jen? Her dress tore, her boyfriend dumped her, she got caught with a flask, and her hair lost it's curls!
Dude: Yeah, she was promatized.