marlinspike 

a tool (as of wood or iron) that tapers to a point and is used to separate strands of rope or wire (as in splicing)

looked at the knot, “better get a marlinspike to untangle it”

marlinspike by SUHEEEHEE March 22, 2021

marlin spike 

When a woman's anus is too constricted for penile penetration and the male must finger her anus in order to relax the sphincter in preparation for anal sex.

Bob said Natalie's ass was so tight he had to marlin spike that shit before he went to town on that ass.

marlin spike by Jogen April 26, 2016

marlin spike 

When a girl's anus is too constricted for a large erect penis and either the male or female uses their index finger to prepare the ass hole for penile penetration.

That bitch's ass was so tight I had to Marlin spike her before I could fit my cock in that hoe.

marlin spike by Brown Jon March 3, 2016