It can be defined.
1.) A plof is the act of farting when someone is sucking your dick.
Ex. - Normally I wouldn't let Angelina Jolie suck my dick. But I would if she were being fucked by Brad Pitt; but, I'd still plof her.
1.) getting farted on while sucking someone's dick (even if it's fake or strap-on-ish)
der- folp is plof backwards....literally.
Ex. This guy took me out to a great dinner last night and when i went to repay him, orally, i got folped. I hate it when a guy think he can just fart on me while i am sucking his dick. I mean, I do have standards.