In casual US Army Airborne lingo, hold squat is used as an expression when you have to wait on someone or something else before you can complete a task, or to mean hang tight motherfucker, I got this..

The casual usage of the word is derived from the command "Hold, Squat" issued during the Jumpmaster Personnel Inspection (JMPI) sequence for combat equipped Paratroopers in the US Army. It is issued at the time in the sequence when the jumper is to lift his ruck, which is hanging at his waist, and squat down so that the Jumpmaster may inspect the underside of the ruck and parts of the parachute harness that would be obscured from view by the ruck.
Specialist: "SGT someone called asking if you had done blah-blahblah."

Sergeant: "Yeah I'm all over that, tell them to hold squat."

Platoon Sergeant: "Hey did you send those guys out there to fix that fuckin' antenna?"

Section Sergeant: "Well we're in a hold squat pattern on that right now cause it's too dark and the wind is too high for them to fuck with it safely."
by ABN_PMPN505 June 19, 2011
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