A fartnami is an explosive fart, often with a follow through at the end. One may need to change their pants after a fartnami.
The lady was laughing so much she didn't realise that her fart was actually a fartnami with some serious power! The smell was horrid and the follow through! She had to go home and change her pants promptly.
Fart•nam•y (Verb)
Farting in harmony, creating a short song with your farts.
Originated from the cartoon Bob's Burgers (Season 6 Episode 14)
During a sleepover, Jacob and Keith created great fartnamy.