Top Definition
sombody says somthing so retarted or embarrasing you say "thats when you know"
retard: what are you talking about! today is already over!
me: thats when you know

t-bagging a claymore? thats when you know
#wow #neck #retard #smarty pants #thatswhenyouknowcopter
by jugglebum0 April 18, 2010
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