If so many normally-upright people use it, is it wrong?
Answer:
The origin (etymological source) of this word comes from fellatio—meaning oral sex (see http://www.etymonline.com/index.php?term=suck ). Thus, this phrase actually refers to a sexual act. Unfortunately, crude and vulgar language has become common in our society today and many people don't know the background or meanings of the words they use.
When we examine the Bible, we find that God does not want us to use filthy language. Colossians 3:8 says, "But now you yourselves are to put off all these: anger, wrath, malice, blasphemy, filthy language out of your mouth." Because of this very clear instruction from God, we recommend people avoid using this term.
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