YGTBFSM 

YGTBFSM: Acronym for "You('ve) Got to be Fucking Shitting Me". Likely military origin.

Troop 1: We're getting recalled for a squadron-wide piss test.

Troop 2, just returning from Amsterdam: You've got to be fucking shitting me (YGTBFSM).

YGTBFSM by poopoopeepeedaddy December 19, 2013

YGTBSM 

You've Got To Be Shitting Me

You've Got To Be Shitting Me!

YGTBSM by Tony Nguyen July 12, 2005

YGTBFKM 

Email abbreviation for "You've got to be fucking kidding me". Often used by Navy types as a show of incredulity.

What? SuppO's serving beef yakisoba again? YGTBFKM!

YGTBFKM by King Neptune March 4, 2006

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

ygtbfkm 

You've Got To Be Fucking Kidding Me, typically uttered in response to anything that is so totally stupid as to be unbelievable.

Note: often pronounced more rapidly as "YiGiTBiFKiM"

Seriously, Congress? You're going to reach an interim deal on the fiscal cliff for now, and then resolve it more permanently in a couple months? YGTBFKM!

ygtbfkm by DaddyG January 10, 2013

YGTBSM 

You got to be shitting me

his statements make you go "YGTBSM"!

YGTBSM by Heir Fubar January 6, 2017