A noun used to label / describe or characterize a person whom has engaged in coitus, and whom was either particularly:
c)frigid, but is coerced by their partner - without resort to rape - to engage in intercourse, and has proved to be unadventurous or generally uncooperative
d)fundamentally a 'dud' in the sack.
e)a person (generally female) who engages in coitus under the pretense that the said act requires them to be both present and semi-recumbent so as to allow penetration, without any effort or manoeuvering(i.e. movement - just lay there and take it)
"Fuck dude! Tahli was a dead root ... I was like fully trying to mach her, but she just lay there."
"She is a dead root man, don't go there; may as well fuck a pie - cause you'll end up doing all the work."