Mostly it's an act of being a gaylonely adult male from Philadelphia PA with bad memory who plays with little boys in a bedroom all day every day, mostly.
They mostly do the philly beat off together on a dailybasis, mostly.
1. A bizarre sex act in which a male receives anal intercourse from a female wearing a strap on phallus.
2. The act is "off-beat" in the sense that it is disturbing and weird and incorporates the feminine name "Susan" due to the distinct gender reversal.
Ted recieved his first off-beat Susan from Jane, and the sick bastard enjoyed it.