The act of confessing feelings for a girl way too early.

This term comes from the show How I Met Your Mother, after the main character Ted Mosby tells a girl he's interested in that he thinks he's in love with her after their first date.

Later in the series, the term "Mosbying" is coined after Ted's friend Barney hooks up with a girl at a party, doesn't want to see her again, and tell her he's in love with her to make her want nothing to do with him.
Guy A: I don't understand what happened. She seemed really into him. How did he scare her off?
Guy B: Mosbying.
by Glamoiglia November 23, 2011
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Verb. "to mosby someone". Telling someone (usually on your first date) that you love them in order to freak them out and deter them from having a further relationship with you.

Originates from the show How I Met Your Mother.
Robin: "I found out Barney loves me, what am I gonna do? It's gonna break his heart when I tell him I don't love him back."

Marshall: "Well, there's an option. High risk but high reward. You could mosby him."

Lily: "Oh no, she couldn't mosby him."

Marshal: "She could MOSBY THE CRAP OUT OF HIM."
by K4m1k4z3 May 26, 2009
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Telling someone romantically involved with you that you are in love with them, completely out of the blue. Making them be completely repelled by you in any romantic way.
A:damn man, i gotta get rid of shelly, Im not into her.

B:just pull a mosby on her, dude.

C:yea man, you can mosby the crap out of her.
by Tedmosby76 May 21, 2009
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Telling someone who you are romantically interested in and who is interested in you as well that you love them, causing them to not feel any romantic interest towards you and freaking them out.
Telling a woman you're interested in and have realized you love at some point you love her, causing her to lose any of the obvious romantic feelings she had for you.

Same for a woman towards a man.

I.e. the exchange between Barney and Robin in How I Met Your Mother, and also the reason for the name itself - Ted Mosby from How I Met Your Mother.

"Tim just pulled a Mosby on Rachel"

"Oh God, he's never going to be able to get with her then. She was talking about how much she liked him just last week too"
by Barney"Suit"Stinson August 09, 2009
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Noun. Describes a guy who completely falls for, obsesses over, and acts like an overwrought douche for essentially every girl he meets, who by the way, is undoubtedly, "the one". Typically characteristic of a guy who is single while all of his close friends are in relationships who desperately wants to be hooked up. Usually found cute, at first, by girls he pursues but then is quickly slogged off.
Steve: "Wow! Logan just met that girl last week and he's already talking about moving in together!"

Tom: "I know. He's such a total Mosby."
by The B-Rex April 22, 2011
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To tell someone you love or have strong feelings for them when you don’t in order to deter them from pursuing any further relationship
Robin: "I found out Barney loves me, what am I gonna do? It's gonna break his heart when I tell him I don't love him back."

Marshall: "Well, there's an option. High risk but high reward. You could mosby him."

Lily: "Oh no, she couldn't mosby him."
by himymfan381 October 12, 2018
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a mosby is, an incredibly good looking person. thats most of the time not the tallest person, generally likes to be center of the attention, and or can have shorter hair.
by -Dr.Person April 17, 2010
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