A fork of Rural Dictionary
When a girl is blowing you and all of a sudden she sucks too hard and sucks all of the semen out of your dick before you can blow your load.
Bro I was fucking my girl last night and she sucky sucky snaked me. It hurt like hell!
Stanley Kubrick's Full Metal Jacket. There is a part with a vietnamese hooker who says this. She also says "Me love you long time". Her words have been quoted countless times, and Full Metal Jacket is one of the most referenced movies of all time. If it was before your generation, you should go watch it. You can say this is just about any situation if you want people to laugh.
Doctor: "Damnit, he's bled out, we've lost him" Attendant: "Sucky! Sucky! Five Dolla!"