Short for "Thank You For Your Service"
A phrase used when addressing a volunteer fireman/EMT usually by a paid firefighter or medic.
Usually snarky, judgmental, and sarcastic in nature.
Look at that guy with the Mainville Volunteer Fire Department "dragon slayer" shirt on. *walks up* "TYFYS - THANK YOU FOR YOUR SERVICE!"
This is used by the Dream smp fandom to make others cry. It means 'thank you for showing me what it's like to be human' said by Slime is Quackity's lore video right before he died.
Person 1: tyfsmwiltbh
Person 2: huh?
Person 1: if you know, you know Person 3: *cries*
The acronym for 'Thank You For Your Service.' Usually used ironically to express that you did not actually want the service in question. It's also a polite way to say "go fuck yourself you jackbooted thug."
Cop: "I'm citing you for a seatbelt violation. It's a $200 fine but it's for your own good."
Citizen: "TYFYS"