Jeremy Roenick -- CHOPS $3 MILLION ... Off Insane Arizona Mega-Mansion

NHL living god Jeremy Roenick is becoming one helluva slasher in his post-hockey career -- 'cause he just knocked $3 MILLION off the price of his INSANE Arizona mega-compound.

The future Hall-of-Famer is desperate to sell his 10,000 square foot palace in Scottsdale ... that comes complete with its own BASEBALL FIELD and GOLF COURSE.

Roenick originally put the place on the market in 2012 for $11.7 million, according to our friends at Realtor.com ... but didn't get the kind of bites he was hoping for.

So, Jer lowered the price to $8.5 million, hoping a $3 million discount will finally bring in the offers.

The place is absolutely sick ... with a man cave, poker room and a car-collectors garage.

Hockey players be ballin'.