Green’s Dictionary of Slang

hood n.²

(W.I. Rasta) the penis.

1991		L.E. Adams Jam. Patois 63: Wood, or Hood: penis.
1995		Francis-Jackson Official Dancehall Dict. 25: (H)ood penis.

SE in slang uses

In exclamations

by my hood!

a mild oath or excl.

c.1380		Chaucer Troilus and Criseyde V 1151: I commende hyr wysdom by myn hood!
1546		J. Heywood Proverbs II Ch. xi: Onely for both I wed not, by my hood!
1596		Shakespeare Merchant of Venice II vi: Now, by my hood, a Gentle, and no Jew.