When you are way to exited about someone that your anal muscle are doing a micro-contraction aka "quivering". A state of arousal usuallyfollowed by a moan, or sexually-induced exhale.
Like Robin Hoods arrow quiver, this quiver is for your man junk. Like a case for holding your arrows, the slot between a women's legs can be a holder for your salami. Another word for vagina, cunt, slit or hatchet wound. Nothing like a nice warm meat quiver on a cold night.
Man I would like to store my meat in her hot fucking meat quiver….. Maybe I should sniff it if first and make sure it's clean before I store my fresh meatin there.