When you see a
loaner douchebag sitting all by himself in a
booth until 2 of his boys come in and sit next to him on both sides, hence the
skein (v-shaped formation)
You spot a man smoking a
hookah suspiciously by himself. 20 minutes later he is joined by 2 equally dull
chaps sitting symmetrically next to him. You announce to your group that the "cock flock" has recovered its leader and is now back in
formation