Top Definition
YCSI is a commonly used acronym for "you can suck it". Such acronyms are common among today's texting-crazy youth and refers to the act of fellatio. This term can be used by either gender, however, without confusing ramifications.
"Ur mom looks hot, lol"
"YCSI"
#you can suck it #suck it #suck it hard #fellatio #si
by HaterCaid March 17, 2010
1 Word related to ycsi
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