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v. to falsify official documents, reports, logs, etc. especially in cases where work was not actually performed.

The area on old British warships below the upperdeck, to give a false perception of the actual amount of ammuniton onboard. This is supposedly how the term was derived.
"Rogge was too lazy to do the 7 day and gundecked the MAF like usual"

"Some people gundeck their whole resume to land top-notch IT jobs"
gundeck by Andy Mack April 16, 2005
Related Words
Gundie guddies gunder gundi grundie gunderson gundersun [gunnie] Gunde gundeck
after consuming an excessive amount of either alcohol or high grade doooberrryyy when you start gettin heavy head sindrome. (we all know what that is)
feeelin all gandie

surr you look like gandolff

you alrite mate...feelin a bit gandie are we?
gandie by mr.zooog January 14, 2008
Can be used to replace any word in a sentence. Originated in Mr. Perez's Spanish 10 class as a replacement word for "brown people". Very few can master this word.
Oh my gundeh! Suck my gundeh! I feel like a gundehed a black man's dick. Your such a gundeh. Gundeh gundeh gundeh.
Gundeh by Coley and Aweean February 16, 2008

gunderplunk

An issue that men frequently have. Gunderplunk is when your testicles become stuck to the side of your leg. Frequently occurs when wearing boxers for a whole day of hard labor in the sun.
Guy 1: Hey, what do you keep scratching your balls?
Guy 2: I've had ridiculous gunderplunk all day.
gunderplunk by fizzle123 May 20, 2010

Gunder Style 

A phrase describing someone who frequently goes out without any form of payment with them.

i.e. Forgetting your wallet
"Matt went to the bar Gunder Style last night"

"Man that bar tab cost me a fortune because Chris went out Gunder Style"
Gunder Style by PViddy December 20, 2012
Gundi is the Hindi word for female gangster or thug. A gundi is often loud, outspoken, likes to call you out on your sh*t and is a feminist.
Don't mess with her, shes a gundi.
Thats a gundi move.
Gundi by kalicoconut January 5, 2018