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1.
A term refering to "Around the world". The only difference is the spelling. The origin of this alternative spelling came from people too lazy to say the "A" in "around".

Around the world means to engage in oral, vaginal, and anal sex in any order during the course of intercourse.
She's such a ho'. She went 'round the world with Phil on the first date.
by Michael O. November 20, 2004
 
2.
kissing every inch of your partners body
I gave her an around the world
by joe redford November 18, 2013
 
3.
When a man is laying on his back while a woman is positioned on his penis, and the woman spins around like a top, without breaking genital contact with the man.

Also, referenced in the book "Choke" by Chuck Palahniuk.
Greg: "So... did you do it with Tina last night?"
Eugenio: "Hell yes, and she went 'round the world."
by Eugenio Formaggio January 19, 2009