The act of vomiting into the mouth of a sexual partner, who should then be courteous enough to return the favour.

This gesture of affection can be repeated ad infinitum, but the rules are that not a single drop shall pass outside of either person's mouth.
Step 1) Eddie moves in on potential conquest. As he moves in for a 'kiss', said conquest meets his lips.

Step 2) As soon as it can be ascertained that lips are parted, the operation has the green light. Eddie triggers his gag reflex and spews a stream of bile into conquest's mouth

Step 3) In most cases, a person's natural reaction to being sick is to turn their head away and to the ground. EDDIE MUST NOT LET THIS HAPPEN. With a deft drop of the shoulder he has manouevred underneath conquest and pressed his mouth to hers once more, catching her bounty

Step 4) Eddie has two choices now: swallow or continue the mouth-rape. Eddie realises that Divine Reciprocity is a game that gets increasingly difficult to continue, so his decision is not taken lightly

BLERRRRGHHHHH
by Tongueless Ghost of Sin November 12, 2009
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when you move your ahnd up and dwon the penis

also know as masturbating or wanking or pulling the plonker or burping the worm
jebular reciprocation causes bad eyesight
by lanky007007 May 14, 2007
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(noun) A reciprocal for sperm; an opening, commonly an orifice, into which men commonly deposit sperm.

Examples: cunts, colons, mouths
Your mother may not look so tasty now, but at one point your father saw her as a wondrous sperm reciprocal.
Your existence is a testament to this.

Though born with a cleft palate, Anastasia rarely hesitated to offer up her agape mandable as any drifter's sperm reciprocal.



by elegantmaskwithafeather August 22, 2008
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The friendship reciprocity ratio, or F.R. Ratio, is the ratio representing the unwritten friendship law that the sum of x-friend's purchases for y-friend should be equal to, or as close to equal to, y-friend's purchases for x-friend. The closer to "0" this ratio is, the more substantial the friendship. Any friend who is significantly negative in this ratio is a shitty friend.
Dave- Dude, Greg "forgot" his wallet again. Had to pay for his lunch again. Not to mention I bought him an Audi for his birthday last month and all I got was a misspelled "Hapie Berthday" on Facebook today.

Nate- Greg is a shitty friend. What's your guys' friendship reciprocity ratio at now?

Dave- I think he's got our F.R. Ratio down to -$3,000,000 now.

Nate- Wow dude, what a piece of shit.
by MasturNater July 1, 2014
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a completely self-absorbed, unaware "friend" (READ: douche) that you do things for *all the time* that NEVER returns the favor, even in times of crisis, always making the excuse that they're working or busy or just *can't* for whatever reason--always an excuse--ANY time you ask them, no matter what; someone who never returns the many favors you've done for them.
"My Dad just died and I can't find sittage for the funeral tomorrow. Since I've watched your kids for free for the past two days, do you think you can sit mine for a few hours while I go to my Dad's memorial service?"

Non-Reciprocating Tool: "Tomorrow? Oh, no way. Sorry. Gotta work online and stuff. You know. Busy and all. Can't. Maybe next time."
by Holly M S July 21, 2010
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Mike better watch what he says about Erica, reciprocal determinism is a bitch
by RTworder August 27, 2013
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