It refers to the male genitals also known as penis or dick.
Quit being a theis!
by Abbie Cain April 22, 2008
a wily puerto rican who is compelely uncappable of making up his own jokes. instead he just reapeats other peoples jokes until they are worn out and unfunny.
o shit here comes theis everyone stop laughing.
by zack January 23, 2003