When someone is overbearing


When someone is overbearing
 
Who died and made you king? (informal)
Who died and made you Pope? (informal)
Who died and made you God? (informal)
Smarty. (informal)
Smarty pants.(slang)
Know-it-all. (informal)
Get off your high horse. (informal)
=Be lass arrogant.
 Who do you think you are?
You think you’re so smart? (informal)
You and who else? (informal)
You and what army? (slang)
 What makes you so special? (informal)
 Don’t break your arm patting yourself on the back.(idiomatic)
You think you’re so hot. (informal)
hot = important
You think you’re such hot stuff (informal)
hot stuff = someone or something important

Also:

Smart-ass. (mildly vulgar)

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