Place it as the closing beat of a reveal, after a tense pause or a teasing build-up, then follow it with an awkward moment sting to hold the reaction. For a longer gag, put an eh eh ehhhh tease just before it so the confession feels even more unexpected.
About this sound
This roughly 12-second vocal clip opens with a bouncy, repeated waka waka chant before a cheerful voice bluntly declares I'm gay. The delivery is light, exaggerated and cartoonish, turning a simple nonsense rhythm into a sudden joke reveal. It feels playful and absurd, like a scene tipping into self-aware comedy just as the listener expects something ordinary.