Citations:zerbert

Noun: the sound that occurs where someone places the mouth against skin and blows, imitative of the sound of flatulence.

 * 2007 - Sarah Nilsen, Does This Book Make My Butt Look Big?: And Who Cares Anyway, It's My Butt - Page 67
 * Everything is going fine until he decides it's time to give me "zerberts" (evidently, to try to wake me up). For those of you who don't have kids, zerberts occur when you press your face against someone's skin and blow really hard — hard enough to make fart-like noises.