Pushing Thread

the need to drop a "deuce" so badly that that it is sticking out and touching the thread of one's undergarment.

Hey Phil, where's the shitter,? I'm pushing thread.

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pushing the green thread

a colloquialism used in phased array ultrasonic testing describing the act of maximizing the signal amplitude over a range of angles during calibration

Yo, did you push the green thread? Your sensitivity is whack at 60°
Took me forever to push the green thread on this notch. Sigh.
What’s the point of pushing the green thread for an ‘S’?

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