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
by AmtrakFan454 February 11, 2011
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A person who is extremely obsessed with trains, usually they don't stop talking about it.
Person 1: Henry is such a foamer! He talks about trains all the time!
Person 2: I know right!
by fc2078 October 28, 2020
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A sacrilegious dumbass who simps over trains, more often than not, over a specific railroad or locomotive. A foamer is often ridiculously stupid and is really hard to argue with because they are so naive with the science and art behind railroading and only care about the trains they set eyes on.
Rail Enthusiast: "Damn that foamer foaming hard for some normal NS SD70ACe with the number 1111."
Another Rail Enthusiast: "Don't worry, I see foamers flipping out over an awful looking Caltrain f40ph with a shitty horn, and thats a normal for me."
by UnknownUser225 November 10, 2021
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Somebody who is obsessed with trains, may or may not work for the railroad. But they love trains so much they foam up in the mouth staring at trains, and jerk off with the foam.
Foamers: oh, you work for the railroad? I would have but didn’t send in a application, but I know everything about trains. I have a 64 track full model train set up through my house, I even sit on my lawn chair and stair at trains going by.

Normal railroad worker: wtf?
by Imnotthat_gaaaayyy June 8, 2018
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(n). A stereotypical fan who loves to make bias and make fake facts of said hobby. Generally, this term is used by anyone who’s overly obsessed with commonly seen trains. This term is also generally accepted in the bus and aviation community.
Oh my god, that kid really said that bus has a Cummins, but actually has a Detroit Diesel. That kid is a foamer
by 901.lax January 6, 2020
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Someone who has an orgasm when they see a train.
Calm down foamer its a train, pls don't cum
by Ohjgnmihh June 27, 2022
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A person who stands by railroad tracks and films or takes pictures of trains
by TwistedXLCyclone July 7, 2021
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