ff15 

ff15 is a term used in the game League of Legends, ff stands for forfeit and 15 is the time at which it becomes possible to surrender. So ff15 is short for 'surrender at 15 minutes'.

This match isn't winnable just ff15

ff15 by OppWitSeriousMembers June 2, 2020

FF15 

FF 15 is a common term that originated from the hit game League of Legends made by the small indie company Riot games. It means to forfeit a game at 15 minutes, the time when you can ff, and has been told in other games by degen league players

Bro my toplaner is feeding so hard, FF15 Jg Diff

FF15 by Nabil Lane October 24, 2023

OMEGALOL.GIGACHAD.FF15.POGMEISTER 

A true gamer one that stands the tests of both time and loyalty/

He was an OMEGALOL.GIGACHAD.FF15.POGMEISTER for calling into work sick so that he could game with his mates instead.

OMEGALOL.GIGACHAD.FF15.POGMEISTER by HiredSapper August 9, 2022

/ff 15 

when you want to surrender at 15.
actually comes from league of legends i think

ryze: "/ff 15 lost game"
riven: "stfu noob report stop feeding fucking idiot ill troll if u dont go afk"

/ff 15 by SFT JohnnAy August 18, 2017