Not funny, didn't laugh
Hey, did you hear the one about the square who got in an accident? He's alright now!
|SFF||So freaking funny|
|FAF||Funny as fluff|
|FAH||Funny as heck|
|NOIRL||No one is really laughing|
|Spoopy||Spooky and funny|
|HHSF||Ha-ha, so funny|
Someone who doesn't appreciate your humor may use NFDL to mean "not funny, didn't laugh." This acronym is an expansion of NF, used to emphasize that whatever joke or anecdote you just sent is extremely unfunny.
If you now realize your joke was in poor taste, you can reply to NFDL with srry, IMS, SBT, or SCNR. If you instead want to double-down (probably not wise), you can respond with TBFU.