Megan Thee Stallion is locked and loaded on her latest single “Whenever.” The record arrives alongside a chaotic music video that finds the rapper twisting into contortions on top of a reception area desk, dancing in the desert, and posing in a fish tank. When she raps “It’s whenever, bitch, it’s whatever, ho/We can do it right now, we can take it out the door,” she means it. Name the time and place.”

“Whenever” marks the first music release from Megan since last year’s Megan: Act II,...