the.com/bleep

means A short electronic tone used to mask or replace a sound — most often a swear word — in broadcast audio.

from Imitative in origin: the word simply mimics the quick electronic tone itself, much like 'beep.' It emerged in the 20th century alongside broadcast technology, once censors had the tools to cut a word and drop a tone in its place — the practice of 'bleeping out' language gave the noun and verb their current, muted-mouth meaning.