The huff of nitrous oxide (NO) left in a carefully managed can of Reddi Wip after all the cream is gone.
Whipped-cream-in-a-can is propelled by nitrous oxide. This usage is the source of the term "whippet". The term has come to refer to any little canister that'll give you a hit of NO.
A type of dog produced from a cross between a greyhound and a terrier, bred for racing.
Also it can mean a small container of nitrous oxide people you to get high.
It is also what you get if you put the words whip and pets together. Which is ironic, because whipping pets is what people do to whippets when they’re on whippets.