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Student Sexuality Information Service: a student-run, non-profit organization devoted to promoting sexual health on the Brandeis University campus through various services. Services are completely confidential. SSIS maintains a library, holds office hours, sells safer sex products for cheap, acts as a referral service, and does outreach on campus through events. Members of the group are trained peer-counselors volunteering their time.
Students in Shapiro Campus Center.
"Yo, where's your girl goin'?"
"She's goin' upstairs to SSIS"
"Cause I be gettin' some tonight, dawg."
by Sexified February 05, 2007
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Jul 26 Word of the Day
Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed
I got a call from X the other night. She had an extra ticket to a concert she bought for a friend, but they couldn’t make it so she called me to ask if I wanted to go because I am her Second String Friend.
by Deus-ex-machina August 26, 2020
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it stands for SPECIAL SEX means your intrested in a certain type of sex, but it's not a fetish.
my recently married friend gave me some sex videos that all had foot fetish porno.later on i thought i developed a foot fetish.but that same friend just told me it was a S.S.I.
by RabidPyro July 06, 2009
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A horrible horrible person. A fake friend. Will do the absolute worst to the people closest to them and not even flinch. Heartless and horrible. Worst kind of person you can meet.
I can’t believe she would do that to you.

Yeah she’s such an SSI👎🏾👎🏾👎🏾
by lolokhahahahah February 19, 2019
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Screw Some Idiot

If a person haven't had sex for a long time, and he/she's getting more and more annoying (because of this), he/she needs to get laid asap.
"- I can't take this no more, it's been ages I haven't slept with anybody, this is killing me! I'm a nice person, why can't I get someone who would have sex with me? Blah blah blah...
- Girl, you should just ssi..."
by awesomenessHU November 16, 2009
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plural: SSI's. Noun. One who works at posh summer internsip and is sexy. Acronym: Sexy Summer Intern.
SSI: Boss, you should take me to dinner/Alaska/drinks because I'm sexy.
Boss: Ok, I'll get you on the next flight.
by The Original SSI's August 02, 2007
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