1 definition by Hannah macintosh

1
SI : meaning ha ha ha(in a sarcastic tone)or your not very smart
randomly made up on the spot because someone mispelt my name so i said si (because that was the bit they missed out) he said "what?" so i carried on saying si just to make him feel like he'd missed out on something. now it is a word! i hope:)
someone makes a joke about you thats not very funny you say "si si"
OR
someone answers a question wrong you say "si" and laugh
by Hannah macintosh April 11, 2004
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