Top Definition
The act of waiting for an indeterminate period of time in idle uselessness without any measure of solace, diversion, or escape.

Origin: Military, Oilfield, et al.
What do you think I've been doing all day? "Thumbing My Sack"?

I've been waiting on you for 5 days, I guess I can "Thumb My Sack" a few hours more.
by Blackrazor July 05, 2011

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