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."
by Aeromoe February 27, 2008
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A customer at a Starbucks Coffee shop that requests for his or her latte to be handed off with no foam on top. The customer believes that because the foam contains tiny bubbles of air, they are getting less of a drink, therefore, no foam means more bang for their buck.
"Oh great here comes that snobby no foamer again.. maybe this time he'll ask for extra hot too.. complex bastard"

"Don't worry Shawn, i'll make sure he has no foam on his latte, and i'll add a wad of spit in the bottom of his cup."
by Baristaboy723 December 31, 2008
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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.
by Brent Higgins February 26, 2006
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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 07, 2018
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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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