Help with slang

[Elba]

Any day someone post a reply to me:

"lock up the frigging topic"

And then I search in some dictionaries and find the next definition:

v. Vulgar Slang frigged, frig·ging, frigs
v. tr.
To have sexual intercourse with.
To perform an act of masturbation on.

v. intr.
To have sexual intercourse.
To masturbate.

frig·ging ( P ) Pronunciation Key (frgng)
adj. Vulgar Slang
Used as an intensive.

And then I got confussed:
May I considered that the sentence is an insult?
May I considered that the sentences is only a cheap sentecen?
How I can know when a slang expresion is obnouxious or not?
What is the differences between slang and idiom?
Thanks in advance

[Unknownsu]

Actually, Elba, the word frigging used here is a replacement for another word. People use frigging because it is more acceptable than its replacement. The word it replaces is a four-letter F word as well which means sexual intercourse. That word is not tolerated.

The sentence is not a direct insult to you. Think of it this way..."Lock the stupid topic." It means pretty much the same thing.

[Elba]

OMG! Then the person who writte that is an obnouxious, a evil with a mask of angel.
Do yu think I musto to report that person?.
Well, I prefer all people know that must to be carfull, because in this forum there are some obnouxious persons that use the english not to learn, but also to insult people.
Thanks Unknowunsu, my dear teacher.