in high school, when a couple walks through the halls, holding hands and looking lovingly at each other, they tend to walk at a speed that makes anyone stuck behind them want to gouge their eyes out. this is called couple walking.
(can also apply to non-couples walking together in the halls at a way below average pace, such as fat girls or teachers)
Caitlin: dude, why were you late for class?
Jessie: i got caught behind dylan and carly couple walking! god, they go about as fast as a pair of fucking turtles.