Is it advisable to use slangs and foul language to sound \cool\?
Well, I dont think using slang and/or foul language is “cool.” Using it on odd ocassions may be just fine. However if you use it very often, you may get habituated in using these words which is not very good in the long run. I would advise you to use such words ocassionally. No you are not orthodox. For every slang word there are are legitimate words which can convey the same thing pretty convincingly.
