Place it right after the late arrival is revealed, not during the build-up. Start the sequence with the running sound effect if they are hurrying back, play this clip for the callout, then finish with ba dum tss once their excuse falls flat in front of everyone.
About this sound
This is a two-second Spanish voice clip of Ecuadorian politician Abdalá Bucaram snapping “¿Dónde estabas, maricón?” in a forceful, confrontational tone. It lands as impatient and accusatory, like being caught out for vanishing, and the blunt wording turns that embarrassment into an aggressive joke.