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3.
The ultimate comeback, because really, who would want it to be their face? Answer: NO ONE. This snazzy phrase often leaves the victims speechless, weeping or just plain confused.
Asshole: Hey FAG those pants look like spandex!
Fag: So's your face.
Asshole: *in shock*

Elderly Lady: Excuse me young lady but you have to pay for that!
Teenager: So's your face.
Elderly Lady: *passes out*
by Landa July 12, 2007
 
1.
The ultimate comeback. This can be said as a response to any insult directed at you. It doesn't even have to make sense, because "so's your face" makes sense in itself.
Mark: Dude, you know you love the cock.
Craig: Yea..so's your face!
by J Tran December 30, 2004
 
2.
A universal comeback to any witty remark someone makes at your expense. Do not worry about context, because it makes sense in ANY context... always.
From Scrubs:

JD: ...if you bring sarcasm my way, baby, prepare to be stung!

Elliot: J.D.--

J.D.: So's your face.

Elliot: That doesn't even make any sense.

J.D.: "So's your face" always makes sense.

Carla: J.D., that's stupid.

J.D.: So's your face! I'm on fire! Heyoooo!

JD leaves victorious.

Laster that day:

Elliot: Oh, what's the matter, J.D., freezer got your tongue?

J.D.: That doesn't even make any sense!

Elliot: So's your face!

J.D.'s Thoughts: Dammit! Walked into that one!
by Elias Creed April 26, 2007
 
4.
The proper comeback to any insult, especially the infamous "Your mom goes to college!"
Sandee:"Your mom goes to college!"
Jennifer:"So's your face!"
by delovely May 24, 2005