In reference to someone (usually but not limited to male) begins displaying behavior that they're jealous, have low self-esteem, and/or passive-aggressive especially towards their partner.
Guy: How many dudes have you slept with? Did you enjoy it? Were they better than me?
His gf: Why does it matter if you haven't noticed anything weird?
Guy: I just want to know.. because I'm curious.
His gf: Geez, what do you have, SDS (Small Dick Syndrome)?
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