Oscillation of a sequence (shown in blue) is the difference between the limit superior and limit inferior of the sequence. In mathematics, the oscillation of a function or a sequence is a number that quantifies how much a sequence or function varies between its extreme values as it approaches infinity or a point.
Herbert is a mild form of abuse meaning a silly, or dim-witted person. The origin of this term seems to be that it was derived from the name Herbert, which meant bright.. It was used in the very direct opposite, to mean dumb.
Urban Dictionary, the only dictionary you write, is a veritable treasure trove for those looking to substantially expand their handle on common English slang. For anyone who has spent more than two minutes on the largely unedited social dictionary, they will also notice that things get real raunchy real fast.