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1.
When two partners engage in sexual intercourse and the male performs cunnilingus on the female during her menstrual cycle, he inadvertently collects some of her uterine lining into his mouth. As he finishes the oral sex, the two partners kiss, and the male spits the detritus of blood and menstrual chunks back into her mouth. This is the art of "meatballing," as the chunks represent what looks like a meatball.
"So, what are you ordering for dinner?"

"Spaghetti and meatballs."

"That's disgusting!"
by Chef Boyardee April 20, 2005
 
2.
The act of sucking chunky menstruation out of a girl's vagina during her period.
Guy 1 : "I went meatballing last night"
Guy 2 : "How did that work out for you?"
Guy 3 : "I got lots of extra protein and iron"
by Lucavi A. D. February 19, 2009
 
3.
When two drunk individuals male or female start sharing their emotions with each other.
Guy 1: I love you man seriously your my best friend. I know I'm drunk but seriously man I love you bro.

Guy 2: dude your meatballing me right now.
by Meatball king February 11, 2011
 
4.
Having sex while one's genitals (balls and shaft) are filthy dirty.
My girlfriend can't stand meat-balling; she even makes me wash my junk before she'll touch me.

After a long day of work, I meat-balled my girl before taking my shower.

by TheBoyz April 12, 2008
 
5.
The act of riding a girl doggystyle while testicals slap against the bootie. Italian chef hat optional!
Mario was really meatballing Lisa last night.
by drumerboiee December 05, 2011
 
6.
the act of "tea bagging" someone only with one side of the scrotum.
i got caught meatballing some dude so he tried to cut off my ball.
by soux13 July 24, 2009
 
7.
the act of whispering to your girlfriend on the phone.
Austin be meatballing with his girlfriend every night.
by fetaljin May 16, 2009