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3.
The male best friend of a female. They do everything together but they're not in a relationship.
"Hey what's Liz doing tonight?"

"She's going out to that new bar with her 'Pseudo Boyfriend' and wants to meet up with us later"
by RHKP July 18, 2008
 
1.
Much like a friend with benefits except the benefits go beyond the sexual sphere. The boy becomes attached and wants both emotional and sexual support from you without any committment. If someone asks, much like friends with benefits, you are not together, just friends. You know, friends who call each other just to say good night, friends who invite each other for holidays, friends who sleepover once a week, friends who have sex and do all other things sexual yet listen to sappy songs in the dark, etc. etc. Really for all intents and purposes you are a couple, but refuse to admit it and pretend everyone else doesn't know it.
Pseudo-boyfriend, "So you wanna hang out tonight." girl, "Yeah sure." P.B, "Well I am hungry so how about we get dinner, maybe go see a movie later." girl, "is it ok if my roommate comes?" p.b, "I just wanted it to be us tonight, I really need to talk to you about some things that have been bothering me and maybe you could stay over tonight" girl,"ok see ya in a bit." Roommate, "so what you up to tonight?" girl, "Just hanging out with __________." Roommate, " right...."
by c and b July 19, 2005
 
2.
the term used to define a person you or a friend is dating but have not put any labels on.

Ex."who's that guy Jane's making out with?"

"oh thats her Pseudo-boyfriend Chris"
by Jessiye December 30, 2007
 
4.
someone that has never been your boyfriend/girlfriend but you know deep down they would be perfect for you so you resort to being good friends. Sometimes living in different states influence a pseudo sitch.
"Monica don't forget I'm your pseudo boyfriend"

Monica: "I know you are ;)"
by Pseudoboyfriend January 12, 2012