entrenched meander

1) Penile penetration so deep that it forces a curvature of the penis toward respective internal organs (male or female).
2) Extremely deep penile penetration.
3) A site along the Colorado River at Horseshoe Bend, in the Glen Canyon National Recreation Area, where the river curves so extremely (270 degrees!), that over time it has carved out an entrenched horseshoe shape.

1) "Entrenched meanders hurt my cervix," said Stacy.
2) "I was thrusting so hard, I think I achived an entrenched meander!" exclaimed Ziv.
3) Scientists describe Horseshoe Bend as an entrenched meander of the Colorado River.