Urbandictionary is the referee here, and determines that "carb" is correct. "
shotgun" in weed terminology refers to (definition #6)
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To place a marijuana ciggarette or marijuana cigar in your mouth backwards(while lit, with the burning end in your mouth) and blowing smoke through the mouthpiece into someone's face or mouth while they inhale.
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and (definition #7)
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when u exhale smoke into someone elses mouth
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Shotgun definition #18 refers to the bong hole but has only 7 votes.
heh heh he said bonghole heh heh
Meanwhile the
carb definition #1, with 258 votes:
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The hole found on pipes and bongs, it allows you to clear the chamber that is found on these devices. You hold your finger over it while smoking the device, and let go when you want to clear it.
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Carburetor is defined in this way but its only entry has only 10 votes.
Carb it is.