So in practice the cutoff frequency is placed far enough below the theoretical cutoff that the filter's skirt is contained below the theoretical cutoff.
Rather, their positions must be described as probability distributions that taper off gradually as one moves away from the nucleus, without a sharp cutoff.
In the late '80s, that word grunge was shorthand for rock bands with a heavy, distorted guitar sound and for flannel shirts and long johns under cutoff jeans.