What is Gasmask?
1.
1) To cover up the sound of a fart by replicating the sound, or a similar sound several times.
2) To make a sound that sounds like farting again at least once so that the people around you realize that it was a funny noise and not you farting.
"It totally sounded like I blew one in history today when I sat down, but I gasmasked it by rubbing my hand on the desk to make more fart noises"
See
