Pronounced, "FFFF-THOW", is code for when you see a woman whose hard nipples are protruding from her shirt but is too close to otherwise point it out unnoticed. Stands for, "Full TittyHard-On".
FTHOTL is an acronym for Fuck The Houses On The Left.
It is a reference to a Social Housing development situated to the left of a popular (but yet to be officially sanctioned) drag strip, deliberately plagued with noise at night - arising out of disdain for the inhabitant's approach to child-rearing.
Bazzle:- My new exhaust is so damn loud!
Toby:- You should use it to FTHOTL.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"