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Similar to 3rd wheeling but the only reason you don't have date of your own is that you're a fat ass thus counting as two people.
Boyfriend (To Girlfriend): Why is that fat girl following us around all the time?

Girlfriend (To Boyfriend): I'm sorry she's 3rd and 4th Wheeling but I felt bad that she was alone.
by Ike Nwamgbe October 22, 2011
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