YGBSM

Motto of the Wild Weasels - You Gotta Be Shittin Me
The expression comes from an elite group of fighter pilots that were formed in the Vietnam war in 1966 to combat increasing losses from Soviet SAM (Surface-to-Air) missles. The mission of the Wild Weasel was to to fly ("troll") ahead of incomming F-105 Thunderchief formations. In essence, the mission was to trick the VC (bad guys) into thinking that the WW (Wild Weasel) was an attaching Thud, when they targeted the Weasels, they would initiate a tactical manuver to hit the SAM site with a radiation seeking missle.
The term YGBSM comes from one of the original briefings when a weasel pilot stated, in content "You're telling me that I have to fly downtown Hanoi, with one bullet, and I can't shoot at him until he shoots at me..... you gotta be shitting me" --- YGBSM

In memory of the Weasels -- my beloved father Lt. Col Larry W. Biediger (KIA) , his weapons officer, Claude Silva (KIA), and Col. David Everson (USAF RET)

YGBSM-Weasels

YGBSM by thuddriver1 October 6, 2009

YGBSM

During the Viet Nam war, US pilots were getting shot down because of surface to air missile SAM sites. In an effort to counter-act the losses, the USAF came up with a tactic called the hunter-killer team concept. This tactic required a pilot, the hunter, to fly low over an area of suspected SAM sites in order for the sites to start shooting. Once the SAMs started shooting, pilots in follow-on aircraft, the killers, dropped bombs and fired missiles to disable the SAM site. When told of the new tactic at a pre-brief, one pilot was reported to respond, "You've gotta be shittin' me!" The term is associated with Wild Weasel pilots who flew F-105s, F-4Gs, and currently F-16s.
Currently, the term is used as an exclamation of shock or disbelief.

"Hey, dude, I heard there was another hurricane headed towards NoLo"
"YGBSM!"

YGBSM by YGBSMM May 21, 2007

ygbsm

you gotta be shittin me

boss---you need to (insert the impossible here)

employee---ygbsm

ygbsm by client 69 March 26, 2008

YGBM 

You Gotta Believe Me

Near-future word for mind control, introduced in Vernor Vinge's book Rainbow's End.

The Pseudomimivirus is something bigger than a nougat advertisement: it's YGBM.

YGBM by 1d3sy9hrab13 January 8, 2019

YGTBSM 

You've Got To Be Shitting Me

You've Got To Be Shitting Me!

YGTBSM by Tony Nguyen July 12, 2005

ygbkm 

You gotta be kidding me

chat dude 1: I saw 2pac at work today
chat dude 2: ygbkm!!!
chat dude 1: what!?
chat dude 2: for reals, you're kidding me!! HOAX!!!!
chat dude 1: wtf! we just had beer together last night...!?!
chat dude 2: OH shit in the shithole!!! my chocolate neighbour.

ygbkm by pseudoman53 December 18, 2012

YGBFSM 

You Gotta Be Fucking Shitting Me

You called in sick two days in a row and now want to use comp time to go to the game today? YGBFSM

YGBFSM by byrddawg55 April 11, 2008