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1.
Eavesdropping.

I believe I first heard this in a Goon Show (british radio comedy from the '50's)
Oi! Quit earwigging on my conversation!
by theKiwi July 08, 2005
 
2.
* Influencing someone by tirelessly talking to them
* Talking someone into something
* Functioning as a whisperer/secret counselor
He's been earwigging me to break up with her, insisting she's a slut.
by mersiren December 17, 2005
 
3.
-Irish slang: when a man puts his toe in his girlfriend's ear.

-an act of foreplay
I was earwigging my girlfriend during foreplay but she just wanted to cut straight to the other stuff.
by JNis March 13, 2010