ha peep
ha peep is what you yell when someone is telling a load of crap and you know it.
"Ha peep! You said you'd finish your homework!", said to a kid who still had crayon on his face.
"Ha peep! You said you'd never eat pizza again!", said to someone who just ordered three large ones.
"Ha peep! You said you'd stop teasing me!", said to your nemesis in the lunch line.