TIFU when my mouth betrayed me at the worst possible moment

There was this teacher in my coaching who taught me physics, and once he suddenly asked me to define a gamete. I wasn’t completely caught off guard because I had a basic understanding of the topic, but at that moment, my mind just went completely blank. When I first blurted out “sex,” I actually meant to say “organ,” but deep down I knew that “organ” wasn’t the correct word either. Instead of quickly correcting myself, I panicked even more, and in that nervous rush, I ended up repeating “sex” three times—“sex, sex, sex organ”—right there.
To make things worse, gametes aren’t even organs; they are units involved in sexual reproduction. So, not only did I say the wrong word, but I also made the situation even more awkward by getting stuck in a loop of saying “sex.” It wasn’t because I didn’t know the answer; it was purely a result of my brain freezing under pressure. I usually have no problem discussing topics like this openly with friends, whether guys or girls, but this time, the nervousness got the better of me. Looking back, it was hilarious and embarrassing at the same time, and definitely one of those moments I’ll never forget.

TL;DR: My physics teacher asked me to define a gamete, and in my nervousness, I accidentally blurted out “sex” three times instead of properly explaining it, even though I knew the right answer.