"Follow for Follow" An invitation to follow someone on Twitter with the assurance that the person will follow you back.
@randomtweeter: @anothertweeter F4F ?
by Tweeter131 May 25, 2010
In the ASMR comunity is known as audios from Female For Female.
I think I'm starting to like f4f VA or ASMR
by vrwe9¿sakák June 7, 2021
Grumman F4F Wildcat - was an American carrier-based fighter that began service with both the United States Navy and the Fleet Air Arm in 1940. Although first used in combat by the British in Europe, the Wildcat would become the primary carrier fighter for the first year and a half of the United States Navy's involvement in World War II in the Pacific Theater. The FM Wildcat, an improved version built by General Motors, remained in service throughout the remainder of the war on escort carriers, where larger and heavier fighters could not be used.

Japanese Navy: Look out, F4F's are coming!
by Silberio October 5, 2007
A term used on numerous social media sites standing for "follow for follow". Users use this as a trick to get more followers.
"Hey Jonathan452, f4f?"
by Amethyst Watermelon December 11, 2015
Fuck for fun
Friend: how was last night? 😏
Him: eh she was just a F4F.
by P.swagthebabe October 10, 2015
Fuck for Fun
Dude, she slid in my DMs and asked if I wanted to F4F
by aviatordad May 2, 2020
"Food For Food"

1.)A trade of ones food for someone elses food.

2.)Can also be used in a way to mock "scene kids" with there PC4PC or W4W etc.

3.) A very funny insider between friends. (:
1.)Hungry Person: Hey, i like what your eating, f4f?
Hungry Person2: YEA! I'll totally f4f.

2.)Scene Kid: ZOMGG PC4PC.
Normal Kid: LIKE OMG f4f -____-

3.) "Haha lets make up our own acronym"