According to Urban Dictionary, one of the meanings of "limp biscuit" is when a guy can't get a hard-on.
And speaking of stuffed biscuits, Urban Dictionary also defines "The Kolache" as an act where a guy thrusts his penis into another person's fat roll.
Not that I put much stock in Urban Dictionary. It's crowd-sourced and doesn't seem to have very good curation.
Well shoot. I guess I better stop call my ho-ho a biscuit.