An exact double of ones self who bangs ( has sex with ) people who are not their significant other.
Exampl #1
Wife: " I saw you F@*king Karen last night"
Husband: " Baby, that wasn't me, it must have been my Doppelbanger."
Example #2 " Dude I swear I saw my girl blowing some guy in that corvette, nah must be her doppelbanger"
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