Foamer 

A term railroad employees use to describe a railroad enthusiast / railfan and the railfan community at large. Most often used disparagingly.

(Engineer to conductor aboard a freight train)

"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."

Foamer by Aeromoe February 28, 2008

Foamer 

The rail fan's equivalent of weeaboo, derived from foaming at the mouth at the sight of some trains

Foamer: zOmG tHaT's A uNiOn PaCiFiC DD40XX
Honest rail fan: fuckin' foamers...

Foamer by CaptainOppai November 12, 2021

Foamer 

Someone who loses their mind over any train, usually a rail fanner or train buff. Most of the time they show no regard for their surroundings or to anyone really.

OMG, that foamer is so annoying! He's always yelling at the train station when a train passes by and throwing garbage on the tracks! GO LOOSE YOUR DICK SOMEWHERE ELSE

Foamer by EL SEXO GRATIS October 3, 2023

Foamer 

A foamer is a rail fan, most likely someone who has just gotten into the hobby, who foams at the mouth when they see a train.

"The foamer's mouth foamed at the UP Big Boy passing by."

Foamer by a idiot lol September 3, 2019

foamer 

Orignally used to describe railbuffs, it now describes anyone who gets excited about something so much that they start foaming at the mouth.

Those geeks that play magic the gathering are foamers. They get so excited over one card that they start foaming at the mouth.

foamer by Brent Higgins April 12, 2006

foamer 

A mentally challenged asshat that lives under the delusion that they’re better than everyone

Lorelius: “God I hate Roy”
Fingledigger: “He’s such a fucking foamer”

foamer by cummer9 March 20, 2023

Foamer 

The type of n00b who would use derogatory rail slang like SCAXliner or Amtrash, complains about the tuning of train horns, tends to endanger his or other's lives for a good photo, and angers railroad crews through his actions.

Also tends to spam youtube haters' channels, and tend to harrangue people via internet, cell phone, etc.

J: OHMYGAWSH AWESOME K5LA ON THIS TRAIN!

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

Foamer by AmtrakFan454 February 28, 2011