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1.
To be extremely embarrassed. Usually the embarassment is the result of one's own actions. Not sure of the origin, but it may come from when clowns are at a circus and they have eggs thrown at them because of their goofy acts or when actors had eggs thrown at them performing in plays a couple of centuries ago.
"I am sure you still have egg on your face after causing a scene in the mall and later finding out that your boyfriend was in the mall with his neice from Chicago instead of another girl".
by VaNellie September 28, 2005
 
2.
Meaning - To be embarrassed.
Origin - Yellow egg shows up vividly well on your face if you don't wipe your mouth after eating, and, unless you're really thick-skinned, that's embarrassing.
Stan had egg on his face after saying he could easily do fifty push-ups, and then giving up after doing just twenty.

Make sure you have your story straight - go public without the facts and you will have egg on your face.
by koravar July 20, 2010
 
3.
Egg on your face is a clear synonym for having ejaculate on one's face.
Betty - "just make sure to get away before you get some egg on your face"

Janet - "I would hate to get egg on my face"
by pinballer101 February 07, 2010