Maybe I'm alone in thinking this way, but I can't really process the idea of Sonic Youth having either intros or outros....

in no particular order:
Renegade Princess
NYC Ghosts & Flowers
Washing Machine
Kissability (that last final chord kicks some major ass)
Karen Koltrane
Jams Run Free
Anti-Orgasm (even though the outro doesn't fit in with the song too well)
Radical Adults Lick Godhead Style

Heck, SY has written SO many good outros, it's impossible to name all of them here. But when all is said and done, however, Karen Revisited will probably be the winner

Female Mechanic is now on Duty