When Electroluux first marketed their vacuum cleaners in the U.S., their slogan was, "Nothing sucks like an Electroluux!" Apparently, the Swedish-speaking people who created that slogan didn't know that in American slang, "suck" also means "to be bad".
"Sucks" isn't a swear word. If something "sucks", that means it isn't good. For example, "That TV show really sucks." You don't live in America, do you?
If you look up the word sucks, it says, to draw something in by or as if by exerting a suction force. The tense that you are speaking about is nothing more then the slang form.
Electrolux (there's only one "u," by the way) has been selling vaccuum cleaners in the U.S. since at least the early 1930s. The use of "sucks" to mean bad is American teen slang dating from maybe the early 1970s or so at the earliest, and didn't enter mainstream usage until years later (I wish it never had).
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