What is That's So Lemon?
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"That's so lemon" is a way of saying something is very cool but slightly off, in the way that eating a lemon or something of that highly acidic or citrusy nature causes one to make /that/ face.
A: That new mansion I bought is so cool!
B: Yeah, that's so lemon! Too bad it's decrepit and beyond repair...
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A male blowing ones load on the pillow of a fellow person and then the person turning over the pillow and having the male love juice on ..