This sound is from Noob Soundboard

Newbie, newb, noob, n00b or nub is a slang term for a novice or newcomer. Earliest uses probably date to late twentieth century United States Armed Forces jargon, though possible precursor terms are much earlier. The origin of this term is uncertain.
See also: Noob Saibot, Dunning–Kruger effect, Supernoobs, Smoke (Mortal Kombat), Vindicators 3: The Return of Worldender, and KSI discography.