"Man, we got some foamers ahead taking pictures...they need to just get a life and find something to do besides hang around the tracks all day."
Also tends to spam youtube haters' channels, and tend to harrangue people via internet, cell phone, etc.
G: Dude calm down, don't be such a foamer.
J: OHMAIGAWD SHAVE AND A HAIRCUT PLZ!?
*cuts in front of parked train*
MUST HAEV GUD GOING AWAY SHOT!!!!1111
As a fan base, they get so excited about something that they start foaming at the mouth.
(2) An asshole who says something about someone but doesn't have the courage to back it up.
(2)He talked shit and didn't even show up for the fight, what a foamer.