istmfg 

Abbreviation of I Swear To Mother Fucking God. Similar to “I Swear To Fucking God” istfg, in that it is an escalation of the original term “I Swear To God” istg. A very dramatic phrase to be used only in exceptional circumstances.

John: I wrecked my car
Dave: ISTG John, again?
John: I hit yours.
Dave: ISTMFG

istmfg by thevalleyboy April 6, 2019

ISTFG 

I swear to fucking god. More violent then just I Swear To God

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Reply: ISTFG if you don't stfu.

ISTFG by a.Ayala December 25, 2010

istfg 

i swear to fucking god

Istfg that girl is annoying

istfg by chickennuggets59 February 20, 2018

IstfgIwkms

IstfgIwkms - I swear to fucking god I wanna kill my self, another way to say I wanna kill my self without saying kms (Kill myseld)

"IstfgIwkms PLEASEE my head hurts so much" - Person 1
"what does that mean?, IstfgIwkms, what does it mean?" - person 2
"it means "I swear to fucking god I want to kill my self" - person 1
"oh ok!" - person 2

IstfgIwkms by MIASMAMAAA September 12, 2023