A nerd who has not yet reached puberty mentally and has not yet expressed an interest in the opposite sex. Mainly of the male species and often plays Megaman or PSP or similar video games and has lame LAN parties and such.
"Hey, that guy's kinda cute. Wanna go talk to him?"
"Are you kidding me? Only from this far away. Up close, he's the epitome of a loser mcloserson!"
A dirty, slutty, whore of a woman. Loose refers to the elasticity of her oft-used vagina.
(At your friend's wedding, a hot, yet obviously slutty girl is on the dance floor, dropping it to the floor and flashing everyone her vag)
Kai: Yo, did you see that girl in the black dress?
Drew: With the brown hair? You mean Jessica. I know her from college.
Kai: Oh... Is she Loose McGoose?
Drew: I mean, she's been known to suck a dick or four...
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.