French into english : djeun's expressions

[Lanig]

Hi,

How would you translate these "djeun's" collaquial expressions into english:

- Il se la pète grave
- ça pipote grave

For "pipoter" see : http://www.chez.com/microwan/pipoter/pipotron.html

I have already found this:
gobbledygook : Noun. Unintelligible jargon, nonsense. {Informal}
It could mean pipotage

bullshitter : Noun. An egocentric boaster, a teller of untruths
Un bullshitter se la pèterait grave.

Would you have a better translation ?

Thanks

[kokoyaya]

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