gut check 

A test of will power, courage, fortitude, etc. Rarely does it involve any physical strength or skill, instead being an almost entirely mental challenge. First heard in the US Army, but has spread through usage amongst veterans.

Jumping off the cliff at night, into the darkened water, with the pretty girl watching: it's a gut check. See what you're made of.

gut check by Trail March 7, 2005

Gut check 

Gut check was originally a tennis term to describe a player pausing a moment to think about what just happened by closely examining and possibly adjusting his racquet strings. Back in the day strings were made of cat gut, commonly refered to as gut. This usually occurred after a great shot by an opponent. As with so many terms it has become popular to describe something very different.

Tennis commentator; " ...after that passing shot by John , James looks like he's taking a gut check"

Gut check by Whackdad May 9, 2015

Gut Check 

A old Los Angeles term used by bullies referencing punching some one quickly in the gut after blurting out "GUT CHECK!"

Even used by close friends that knew each other on a good level.

It became very popular in the 2000s and is still used mildly by teens today in Los Angeles.

Dontrelle: "GUT CHECK!"
*Punches Keron in his gut randomly out of nowhere*

Keron: ".. You BITCH ASS NIGGA!?! ... Ughhhhrrrr... I'm a fuck you up, bitch nigga I'm a KILL YOU!!!!!!"

Gut Check by SouthCentralLosAngelesNigga November 28, 2020

gut check 

having sex, intercourse, fucking; to fuck a girl. Straight up, but hard; knocking the bottom out of it

I bought my girl a new outfit last weekend. She looked so hot dressed in it that I had to gut check her before leaving for the party.

gut check by RAGGGAN December 1, 2006

Gut Check 

Verb: Only performed in a threesome, whilst the tramp is riding ones cock, she sucks the others load into her stomach. She then tells the one being ridden to punch her hard In the gut. At which point she orally ejaculates the previously swallowed load, onto the one being ridden.

Lisa was frustrated with mike and Dave, and decided to perform a gut check the next time they had a threeway.

Gut Check by Big D johnny layer October 24, 2019

Gut check time

A time to test your of will power, courage, fortitude, etc. Rarely does it involve any physical strength or skill, instead being an almost entirely mental challenge. First heard in the US Army, but has spread through usage amongst veterans and wrestling announcers.

when two or more wrestlers have been fighting for a long time, and are both exhausted, its gut check time, to get back into the match.

Gut check time by Heathy82 February 19, 2012

Gut-check Luke 

The friend that backs up your gut vibes when you’re about to make a bad choice on a dating app because you’ve let emotions or desperation take over.

A: I don’t know if this person is crazy or amazing.

B: Well, what did your Gut-check Luke say?

Gut-check Luke by TreeHuggerLove November 6, 2019