foo diddle doo 

When someone is bored in a discord chat room and wants to talk to people but doesn't know how to get their attention.

Random person: FOO DIDDLE DOO ;-;
Some other dude: yo wtf??
Same random person: oh hai how ya doin? owo

foo diddle doo by LieutenantPlayz101 June 11, 2018

foo 

It means basically your fake.

“bruh that girl is foo”
“look at those foo ass niggas”

foo by Dmvslangs June 13, 2018

insane foo 

A person who is mentally unstable and acts without thinking about any of the consenquences of his actions.

and / or

A person who does weird and or talks weird shit, not necessarily negative.
Can be you used both as a negative or positive remark.

"You remember B, that insane foo?"
"For sure. Dude fuckin' went on a week speed bender and ended up looking like a corroded nutsack while babbling some religious bullshit."

"Time is not even real man. We only exist in this moment and die as each second passes We are here, then we flicker out, and are born anew."
"Haha man you're an insane foo!"

insane foo by st0nek1ng December 25, 2018

FOO 

The opposite of oof. What you say when you have something to say but don't wanna say it xD

"Do you like me?"
"Foo."

FOO by YELNUR February 12, 2019

Foo 

The “N word” for Mexicans, usually used by gangbangers, gangsters, or any other cholo to either insult the second person or if they’re a fellow cholo, refer to them by the pronoun “foo.”

1. “Don’t disrespect me foo”
2. “Ey foo, pass me that drink brother”

3. “What you want, foo”

Foo by Gonzi123 March 23, 2019

Foo 

another word to call a person. Mr Viscia slang for “bro”. Became very popular at Carondelet and Dela Salle.

“What’s up foo”
“This foo”
“Your a foo”
“Foo are you dumb”

Foo by Handledrunk April 30, 2019

Foo 

When something is not what it was intended to be or does not work.

"Did that shawty give you her number?" "Nah man it didn'the even work, that shit foo."

Foo by LightBoyDan May 2, 2019