lip fart n.
(US teen) a farting noise made with the lips.
 | ‘Can All This Grandeur Perish’ in Short Stories (1937) 207: The kid turned Reilly’s hat around backward, gave him a lip-fart, and walked away. | |
| Valley of Fire 135: Someone made a lip-fart [HDAS]. | |
| Seventh Babe 208: Billy, did you tell him no more lip farts? [HDAS]. | |
| Breaking and Entering: Stories 131: She turned and did a lip-fart, adding, ‘No way.’. |