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!
by Level 7 August 11, 2009
Get the S on a D mug.
Short for or a nicer way to say "suckin the dick"
"I took this girl out last nite and she ended up s-in the d"
by Dane Shearer September 8, 2006
Get the s-in the d mug.
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!"
by sonadpod November 10, 2015
Get the S on a D mug.
Lots of Sexually Transmitted Diseases
I can not find my L O S T D girlfreind!
by Baptiste Bidonde July 7, 2006
Get the L O S T D mug.
Tryin to smoke?
F S Y D
by Co Lew February 21, 2008
Get the F S Y D mug.