When I say, "Suck it," I don't mean genitals. That's crude, and you can catch STDs that way. I am talking about a tailpipe.
I generally say this to elderly or mentally deficient people who get in my way in the supermarket. I accompany the directive with a visual demonstration, open mouthed and head bobbing air-tailpipe sucking with a loud whoosh of carbon monoxide inhalation. I repeat both the directive and the demonstration for emphasis as follows: directive, demonstration, directive, demonstration, directive, demonstration, directive, directive, directive, lengthy demonstration with eye contact sustained throughout.