Philation
Not just any sigh, a special sigh... with a slight ahuh at the start and then an annoyed out release of breath(quite long).
Example:
Boy A: I got pissed last night and ended up doing weed.
Boy B: Ahuhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
Boy A: Wow, that's a philation there...
Boy B: What?!(confused)
Boy A: I got pissed last night and ended up doing weed.
Boy B: Ahuhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
Boy A: Wow, that's a philation there...
Boy B: What?!(confused)