WTF
On the track, co-written by Drake, Beyoncé sings the line: "Spazzin' on that ass, spazz on that ass."
Although the word "spaz" is often used colloquially to describe "freaking out" or "going crazy," it is derived from the word "spastic," which is considered demeaning to people with spastic cerebral palsy. According to the Centers for Disease Control and Prevention (CDC,) the disorder affects a person's ability to control their muscles, especially in their arms and legs”
amp.cnn.com
On the track, co-written by Drake, Beyoncé sings the line: "Spazzin' on that ass, spazz on that ass."
Although the word "spaz" is often used colloquially to describe "freaking out" or "going crazy," it is derived from the word "spastic," which is considered demeaning to people with spastic cerebral palsy. According to the Centers for Disease Control and Prevention (CDC,) the disorder affects a person's ability to control their muscles, especially in their arms and legs”

Beyoncé to remove ableist slur from ‘Heated’ after backlash | CNN
Beyoncé says she will remove an ableist slur from her new album, “Renaissance,” after facing online backlash and criticism from disability campaigners.