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An abbreviation which stands for "Send Your Buddy Some Titties Day", which happens to be every Monday. This most glorious of days is celebrated by, quite literally, sending your buddy some titties whether it be by picture message, email, Facebook, etc..
Bro A- "Dude, why'd you post a bunch of pictures of tits on my Facebook?"
Bro B- "Its SYBSTD man.."
Bro A- "Oh... thanks buddy!"
SYBSTD by C-Los Fo' Shizzle March 4, 2011
Related Words

sycksyde 

a horrocore rap group out of indiana. feat such rap artists as Bob E. Nite,Franky Frank,Ensizion,Nizos,Mr. Kiltcha,IcePick Willie...
It's not the westside,it's not the eastside,nor north or south...it's tha SYCKSYDE!!!!!
sycksyde by NOCHRCH March 11, 2004

sycsmdiydlms 

Means “so you can s*ck my d*ck if you don’t like my sh*t”
so you can … (sycsmdiydlms)
sycsmdiydlms by heydelilah June 3, 2021

sycsmdiydlms 

i dobt even know what tf this is I saw it on m y fri9ends discord thingy the whats it called STATUS her status
hey can you tell me what sycsmdiydlms means? pls i have no idea bro
you say it when people do you petty or someone cancels plans
"Can't go anymore." "Sycass."
sycass by Nick fader January 15, 2017
so you come suck my dick
“sycsmd then”
or ..
“sycsmd then maybe i’ll eyp
sycsmd by iamkaiii February 28, 2023