Just to provide a counter example, when I see language like that it is usually an indicator to me that they're is in fact a real human writing the copy and not a committee of marketers trying to pander in order to increase profits.
It's probably not a smart move based on the other comments I'm seeing, but if you want to market things to the niche I'm in, you might find some success with it.
I noticed it, it didn’t really bother me, but it didn’t make me think more favourably towards your product either.
By the sounds of the other comments on here (and the fact that you’re getting downvoted for even asking, to which I can only think “wtf?”) I suspect you’re better off rephrasing that particular line.
It's not so much off-putting as it is unprofessional. I don't mind "bad words" in conversations with people I know, but I can't recall a single instance of their use in a software sales pitch (which is what your landing page should be). It implies familiarity where there is none: I simply don't know you. This is not the place to use Reddit slang.
Judging by your response, it was not in good taste. Curious to anyone else reading this: is a statement like that offputting?