Anything that lets you sit (chair, couch, etc.) is called asstray after you get up from it. Because the seat becomes hot after you sit on it for a long period. It is a blend of ass and ashtray (ashtray is hot as people drop the ashes of cigarettes into an ashtray).
(In a bus...)
Young man: Come ma'am. You can have my seat.
Old lady: No, thanks. I do not want my bum to get roasted by the asstray.
While knocking the dust off from behind right before u finish light a cigarette ash on her back put it out on her her anus so it squeezes your dick when you cum
While smoking a cigarette or a cigar discard your ashes in a females ass when you are finished suck the ashes out and feed them to her like a momma bird would do to her chicks
Someone can have an ashtray heart if they always falls for smokers, then making their hearts into ashtrays as the romance fails and gets put out on their tray, often due to fear and failure of commitment.