When you have to take a crap so bad that it feels like it has already started to "peek" out your ass similar to a turtles head when it comes out of its shell.
The turtle is peeking. If I don't get to a bathroom right now, I'm going to shit my pants.
The act of peeking out of blinds or curtains in a rapid and deliberately inconspicuous fashion, consistent with the effects of methamphetamine, under duress of extreme paranoia that one is being surveilled. In extreme cases this phenomena can last days on end, and typically worsens with increasing sleep deprivation.
"Dude did you hear someone outside?"
*Tweeker Peeks*
"Shit! You're right!"
*Tweaker Peeks again*
"OH FUCK. OH FUCK. THEY'RE WATCHING."
"What the fuck are we gonna do?!"
*Tweaker Peeks again*
"DUDE THEY'RE LOOKING RIGHT AT US!"
*Tweakers go to a different window*
"Are you seeing that red LED across the street?"
*Tweaker Peekin*
"Fuck! It must be video camera!"
"OH FUCK. WE'RE FUCKED."
*Saga continues for days*
A euphemistic expression regarding the extreme urgency to defecate and holding it in as much in as possible. Having the pressure of a fecal turd poking itself partially out of the bum hole while trying to make it to the closest restroom.
Roger sprinted down the hall from his desk to the restroom. He has a turtle peeking.