thac0 

To Hit Armor Class Zero.
Originated from Dungeons and Dragons, where the lower the armor class, the better. An overly complicated system that almost everyone will admit sucks, especially when compared to D&D v3.x rules to hit.

Brandeth the 1st level Fighter has a THAC0 of 12.

thac0 by ShadowSiege April 14, 2004

thatc00kie 

a popular tiktoker who get his/her audience from a “GingerBread Puppet”

thatc00kie

thatc00kie by yoshigamerr March 31, 2021

Thaco 

Short for thigh taco; The crease where the upper thigh meets the waist. More apparent when squatting with a thick ass and legs

She squatted down and grabbed my dollar bill with her thaco.

Thaco by Duke Bruin December 16, 2022

thacket 

A men's jacket, most commonly the color white. Primarily bought at stores like express or the men's section of forever 21, the jacket has a high collar that is often left unzipped- framing the face in the most homosexual way possible.

The thacket will most often be worn with an american eagle shirt and matching white shoes. Wearers of the thacket are usually gay.

"I laughed so hard when Kenny got a big ketchup stain on his thacket. No bleach is going to make that white again."

thacket by carcarcarpediem July 28, 2009

thach 

the best person you'll ever meet, chill as hell, sexy as hell, and cool as hell.

thach is the coolest person ever, he's so chill

thach by secretivebear March 7, 2015

Thackwhap 

The act of jumping or running and subsequently having your scrotum smack against your thighs and causing a clapping noise to be made.

Last night at the party, i was fist-pumping in front of Katie like a total douche, because women totally like douche's, and i thackwhapped right in front of her, and she started laughing.

Thackwhap by RoflCOCK May 12, 2011

thachi

bedtime, sleep, feeling sleepy.

it's thachi time!

i'm going to thachi now.

i feel thachi thachi.

thachi by anahcra April 22, 2008