What does fos mean? View the definition of fos and all related slang terms containing fos below:
full of s**t
Usage of FOS
The abbreviation "FOS" is a shorthand for the phrase "full of s**t", which is used to describe someone who is being dishonest or insincere. It can also be used to describe someone who is talking nonsense or making up stories.
Example of FOS used in texting:
1) Friend A: "Hey, did you hear about that guy who said he won the lottery but never actually did?"
Friend B: "Yeah, he's FOS."
2) Person A: "I'm pretty sure I could run a marathon tomorrow without any training."
Person B: "You're FOS, dude."
3) Text message from a friend: "I heard that you got back together with your ex. Is that true?"
Reply from You: "No way, that's FOS."