A term used to describe freshman, typically in high-school.
A "frosh" is typically out-of-line, annoying, cocky, over confident, hormonally-driven teenager. Frosh are also known to cluster in packs such as wild animals do. Frosh are commonly seen in a school cafeteria or "commons". Frosh will frequently get lost, make stupid comments, and try to suck up to upperclassmen. There are some "legends" known as the Anti-Frosh which is any freshman's worst nightmare.
Dude, you are such a freakin' frosh. Who do you think you are? Get in the back of the line.
"In order for high-school students to live a happy and peaceful school year, the frosh must be constantly shot down, physically, socially, emotionally, and mentally." - Anti-Frosh HandBook