Yes, I can do the farting noises by cupping one palm under an armpit and jerking that arm up and down. If I go slow, I can make a long, very convincing fart sound.
Well, actually all of them are very convincing.
Not bragging, only being factual.
Edit:
I was with a woman in the 90s for like nine years. She was angry at me about something and became quite nasty verbally. I was damn determined not to engage and say nasty, mean things back to her. I got up and walked out of the room doing the fart noise under my arm. Pissed her right off without saying a word. LOL!