Turtlein'

While you are anywhere other than a bathroom, you have to deficate so bad that your fecal matter starts coming out of your ass. In essence your crap is poking out of your ass like a turtle's head.

I had to shit soo bad, I was turtlein' while walking home from school.

Turtlein

Almost shitting your self like how a turtle’s head is peaking out

I was turtlein