The act of stimulating another individuals genitals and upon the point of climax, inserting the mastubator's thumb in the masturbatee's anus.
by PizzaPastaBeebateeBobbity May 20, 2021

Person #1 -"How long has those two been in there"
Person #2 -"Probably doing the Kentucky plug, after that it will smell like dead fish carcases, a public pool and in some cases blood."
Person #2 -"Probably doing the Kentucky plug, after that it will smell like dead fish carcases, a public pool and in some cases blood."
by Fuckeeandtheshittee May 20, 2021

by Brandon's fat cock May 20, 2021

Whenever someone just puts a thumb in any kind of void that requires filling, including but not limited to: an anal cavity, your cousin’s genitalia, the eye socket of an enemy, or your own wound from an exploding firearm
by BasicBassist5 May 20, 2021

by TheNextEpix May 20, 2021

When you stick the thumb of your off-hand into your sister's ass, while you cover her mouth with the other.
Jethro was enjoying his time with Jenny while their parents were away, so he slipped her the old Kentucky plug just before she came. She gushed more than KB's jugular after a slap round.
by DaddyDingDongs May 21, 2021

Yo dude last night was crazy. I gave Sarah the good old Kentucky plug... Yeah she didn't make it sadly.
by Nut_sockkcos_tuN May 20, 2021
