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Very subtle short form of “your mom”/“your mother”, originally part of a knock-knock joke. Similar to “Joe”/“joe Mama”, the casualty does not have any idea that they could be spoofed (unless they know the joke, of course).
“Knock-knock!”
“Who’s there?”
“Ermo”
“Ermo who?”
“Er mom!”

“Bro, I had an amazing night out with Ermo yesterday!”
“Nice! But who’s Ermo?”
“Er mom!”
Ermo by O Rei December 16, 2022
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zander ermold

Slow super stud birthday boy that goes to governor mifflin. He runs cross country and is very slow and a super stud birthday boy.
Man youre a slow super stud birthday boy zander ermold!
Related Words
Ermonie is an girl with a good looking body , has abs, got some cake, and everbody wants her , but she only want that one boy she can settle with and love until death. She has an amazing personaility and everbody is secretly jealous of her and wants to be like her. She can get anybody she want but she want an loyal , trustworthy , and freaky boy that isn't gonna break her heart. She is funny asf, and will brighten your day.
Look at ermonie go

Ermonie your butt getting fater
Ermonie is your bf putting that work in from behind
Ermonie by issa_tayylor April 16, 2017
sex without pleasure, in other words fucking a sumo-wrestler or not having fun when having sex
Bob was ermosa-ing when he was fudging that asian chick.
ermosa by MATTHEW THE PIMP November 14, 2004

ermotherfuck 

the word for a woman who was fucked by a motherfucker
some motherfucker fucked me last night, I'm an ermotherfuck now
ermotherfuck by hundredpercenthuman December 16, 2021
Wen you have sex with a 500 pound aisan
ermosa by Garen November 14, 2004
A mispelling of emo. Adding the 'r' and over exaggerating the 'oooo' adds a comical hint to the sterotype of a emo. It then becomes a joint word of emo and a cow which is comical in itself and not the least bit meant to cause offence to a "emo" or a "cow" =]
*person with large hangover lays across mates bed writing lyrics on her arm because she cant afford and hasn't got any paper*
*friend walks over and starts to write emo across arm but hungover aswell mispells it as ermoo*
*friends collapse in giggles for a long time*
ermoo by Nicola EB December 14, 2008