1. [late 19C–1910s] a seat, a chair.
2. [1950s] (US teen) the vagina [? deliberate euph. for twat n. (1)].
3. [1970s] (US) an act of defecation; also, of women, an act of urination.
4. [1970s+] (US) excrement.
5. [1990s+] (US prison) the electric chair; electrocution.
[1970s+] to defecate.