Becky with the good hair better watch her back.

“Resentment” is a staple track at Beyoncé concerts, and, as per usual, she sang the hell out of it at the Sunday night On The Run II show in Los Angeles.

She surprised fans, however, by switching up the lyrics, reports BET.

The song’s official lyrics are: “I'll always remember feeling like I was no good/Like I couldn't do it for you like your mistress could.”

At the show, she sang: "I'll always remember feeling like I was no good/Like I couldn't do it for you like that desperate, mediocre, whack b***h could."

While many fans would like to know just who the mysterious "desperate, mediocre, whack b***h" is, it's probably best for Becky to stay in the shadows. 

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