When a person laughs so hard that a sound is emitted from their throat, somewhat resembling the sound of a duck.
Boy 1: Hey did you see Vanessa on the weekend?
Boy 2: V-v-v-v-vanessa? Is that her name?
Boy 1: Yeah, why?
Boy 2: WAS SHE D-D-D-D-D-DUCKING?!?!
Boy 1: NO SHIT BRO, NO SHIT! Wait, no, you're supposed to say that she's hott...
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