When a British person (tan) explains something thats blantantly obvious/false in a condescending manner to an Irish person because they're British, think they're "great" and have no grasp on their countries history.
"You know you Irish should say thanks to us if we didn't invade you you'd still be pickingpotatoes"
"Class tansplaining"
When frustrated manly men go and flood the Urban Dictionary with their definitions of the word Mansplaining, because they know it better than the feminists, actually.
Greg is so pissed off because his professor didn't want to hear him explain her area of expertise to her in his opinion, so he went meta-mansplaining in UD and invited all his friends too. (See mansplaining )
When people from San Franciscointerrupt you while you're having a neutral discussion to assert their misplaced sense of entitlement and reassure you that whatever you're talking about they definitely inherently know the answer, after all, they're from San Francisco.
Tom was talking to John, a San Franciscan, about the topic of homelessness until John interrupted Tom mid sentence and began sansplaining to Tom because he feels a false sense of superiority which he carries as badge of entitlement wherever he goes.