A combination of the words "man" and vagina "in reference to a man (generally one who grew up in the 80's and 90's listening to hair bands such as BON JOVI and WHITE SNAKE )
wearing an ultra tight pair of skinny jeans where his crotch area would be left with the appearance of having vaginal lips protruding crudely on either side of the seam of the crotch of the pants (also known as "camel toe" or ".large moose knuckle " when referring to a women )
1."Gross Man. I told him to remove his Mangina the fuck out of my face and try wearing pants that fit once in awhile. "
2" Phil now just hold on a minute, don't get your Mangina all knotted up... I mean like any more then it is... Lol!"
Literally as it sounds . A male vagina. A slit that is formed in the forefront of the crotch of his pants caused from wearing his pants too tight . Therefore giving the illusion of a giant vagina from the bulkiness of stuffing their junk inside their pants .
Collette "Holy shit... did you see the MANGINA on that dude? I guess he's not planning on having kids ...gross!"
Annette :"those pants are way too tight on you Jeremy , they give you a massive Mangina !"