Basic meaning is "definitely". Shortening of the term "for sure".
Typically used when genuinely excited, so usually accompanied by an exclamation mark.
Originated in early 2009 within the pseudo-indie-bizzaro-trendy scene in Perth, Australia.
Note on pronunciation:
"Fow-sh", where "fow" is like in "bow and arrow", not "fosh".
"Are we on for tonight?"
"Fo'sh!"
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(Verb) To rumble someone (or oneself) is to significantly impair their (or your own) successful functioning in any aspect of life, usually either through laziness or alcohol.
"Are you ready for the exam?"
"Nah bro, I went out on the piss last night, didn't get home till 6am. I've rumbled myself pretty hard."
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