Green’s Dictionary of Slang

red-hot poker n.

[hot adj. (1a) + poker n.1 (2)]

the penis.

[US]Trimble 5000 Adult Sex Words and Phrases.
[US]Maledicta IV:2 (Winter) 196: When the red hot poker is foaming at the mouth and ready to spit, the gasp and grunt (rhyming slang) should be ready to let down its spendings.