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S on D Theorem 

The theorem states that if a man witnesses the siting of tits, he must shit on at least one dick.

Converse: If a man has shit on a dick, therefore he obviously has seen tits.

Biconditional: A man will shit on a dick if and only if he has witnessed a pair of tits.
You know what the G-man says. If you see tits, you gotta shit on a dick!

The S on D theorem was on the test. But there was no dick to shit on!

Hey guys....I just saw tits. Would you mind?

S on a D 

can also be said as SONAD one word - it is to suck on a dick.
Idea from the movie Forgetting Sarah Marshall - "You don't wanna stick your P in a V!" "No but I wanna B my L on somebodies T's."

I want S on a D!
S on a D by Level 7 August 10, 2009

B's On My D 

Short for "bitches on my dick."
"I've got so many B's on my D!"

"My D must be covered in honey because there's B's all over it!"
B's On My D by stewie noodles January 7, 2008

S on my D 

A faster way to tell someone "suck on my dick".
Matt: Hey dude are you gonna finish those nachos?

Joseph: S on my D.
S on my D by josephswalm November 11, 2007

S on a D 

The term a drunk girl uses when she wants to suck on your dick in a Taco Bell parking lot.
Drunk girl: "I want to S on a D!"

*sees you chilling in your car at Taco Bell*
Drunk girl: "Hey can I S on your D?"
You: "What's S on a D mean?"
Drunk girl: "Suck on your Dick!"
S on a D by sonadpod January 13, 2016

throw some d's on that bitch 

Put 20" rims, most commomly referred to as "dubs" or "d's", on your car/truck.
"Just bought a Cadillac, throw some d's on that bitch! Just bought a Cadillac..."