Having to take a dump so badly that the turd is starting to wiggle its way out of the gate. Incorrectly defined on urbandictionary.com as turtle head, "turtle tail" is a much better descriptor for a tapered turd that has quietly poked its way out of your posterior.
by mig May 7, 2005
The opposite of a turtle’s head. Having made it to the lavatory, dropped a big one and flushed. The turtle’s tail can be found lurking on the consumer side of the U bend.
by Dfsjdjdj December 5, 2020