anonymus774 said: Why the hell is this such a popular pairing?
Opposites attract maybe?
Besides that, Flippy is one of the most popular characters on Happy Tree Friends, and it's speculated that Flaky may have a crush on him. (They certainly appear to be good friends if "Party Animal" is to be believed.)
On the other hand, Flaky did try to kill him in "Without a Hitch", so she may actually have a chance at survival should Flippy flip out again.