It is a much more invasive pat-down that involves touching, probing, and feeling your
body, including your genital area, to determine if you are concealing something.
It is what the Transportation Security Administration (TSA) will do to you if you opt-out of the full
body scanner, which takes a naked picture of you, before boarding an
airplane.
TSA Agent: "If you won't let me to take a naked picture of you, then I'm going to
rub your
penis."
Child: "That would be sexual assault."
TSA Agent: "Nonsense, it's just an enhanced patdown.
Now spread your legs."