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A medical doctor who specializes in female plumbing, aka the reproductive system. From "obstetrician-gynecologist."
I was an amateur OB-GYN before my arrest. I liked sticking my nose into women's snatches.
OB-GYN by Cornholio November 4, 2003

Orgynisation 

A club/organisation that meet and have sex orgy's
I went to the local orgynisation and fulfilled my sexual fantasies
Orgynisation by Hardcoreblob November 22, 2016
Obi-Wan Kenobi's half brother, celebrated pervert. 2000 alternate Republican delegate.
Call OB-GYN Kenobi for all your heating and cooling needs.
OB-GYN by A. Horace Isahors April 9, 2005
a text-ese exclamation of shock or surprise at the news you get from your gynecologist.
Dr: It seems you have three ovaries.

Patient: How many am I supposed to have?

Dr: Two.

Patient: OMGyn!
OMGyn by hmcdesq May 18, 2010
from courtney love's 'but julian, i'm a little older than you'
i actually don't know what it means.
'Busty co-eds live live live
You'll crash the car, man, if you drive
1-800, 1-800, 1-800 wired
OBGYGYN
Triple xxx
Time that you and me
Had lots and lots of meaningless sex
Erotic city VIP
The pornorific girl in me
I came and now i faked it
He's still tied to the bed'
obgygyn by neonxonxblack July 28, 2008

OMGYNAIMA 

Literally translates too, "Oh my god your nuts are in my ass!"

This is a new sexual trend where a man spreads a woman's ass open, generally using a hoop earring, and then dips his testicles inside.
Last night my boyfriend totally did the OMGYNAIMA and it was amazing!