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1.
An ass gasket. A paper toilet seat cover commonly found in public restrooms.

This expression has been common since at least the 1950s, and cold be older.
Mrs. Murphy put a Texas t-shirt onto the toilet seat in Hannigan's Bar.
by Cap'n Bullmoose April 23, 2005
 
2.
Name given to the disposable toilet seat covers, as often found in public restrooms. With center ring removed, they make an excellent "half-tee" and will help prevent sunburn on your shoulders. Often readily available at outdoor concerts and are very affordable.
" ... looks like it's gonna be a hot day at the park today, better grab some texas t-shirts while we're gettin' beer at the quickie mart ... "
by marscopar April 06, 2010
 
3.
Usually a Texas T-Shirt is given to a female with a flat chest. A male or female must take a shit on her chest and then mold the shit into breasts. This practice is mainly found in South America.
I gave her a texas t-shirt and she got so turned on!
by TitsMcGee6969 November 13, 2010
 
4.
1. The act of a man giving himself a pearl necklace and then proceeding to rub it into his torso on all areas that a t-shirt would cover. Preferably the man would be wearing only a fanny pack while this is happening but is not necessary.
2. Any sexual act preformed while wearing a fanny pack. This act may be with partner/s or alone.
Girl 1:I'm so jealous of my boyfriends skin! It's almost like his upper arms and torso just glow!
Girl 2: I knew you weren't putting out for him.
Girl 1: Huh?
Girl 2: Obviously he's got plenty of time to work on his Texas T-shirt so you must not be milking out the jizz
by gertrude07 August 26, 2014