Being a third wheel of epic proportions. Relates to when there is one less girl than guys, and once everyone's paired off, there's one guy left who awkwardly stands there and draws attention to his awkwardness.
"John, Amelia and Mark were all watching TV. Mark and Amelia started making out. John sat there for a few minutes feeling awkward. Then he made a big show about getting up and leaving."
Guy to friends, "dude. Marty, Chase, Gary and I left with these 3 girls, and i totally ended up johning it"