Used on MSN type messenger programs. When you are talking to someone you set your name to something that applies to the other person without telling them. 100% success rate at least.
See Example.
I Wish You Would Ask Me Out: (<--Your Display Name)
hey watsup?
Some Random Girl: (<---Their Display Name)
Err not much. wanna go out?
I Wish You Would Ask Me Out:
geez it works. i love DPI's.
"Don't poop in your pants." Can be used as an abreviation in times of chaos or utter outrageousness. Best used when somebody is freaking out about something that is not a big deal, or when somebody is litterally on the verge of pooping in his/her pants.