Definitions by Target corp.

Kmart 

A nickname for someone who is hated by all, someone who is so unfunny and annoying there's a name for it

"We don't Call him Tyler anymore, call him T Kmart"
"You heard about J Kmart? He said something really offensive today"

Kmart by Target corp. February 10, 2022

Heikel 

A female with manly features, which is usually confused with a professional football quarterback.

Boy 1: OMG look at that long haired dude!!!
Boy 2:That's no dude, it's Heikel.

Heikel by Target Corp. March 10, 2007