President Obama Trolls Canadian Prime Minister ... 'Where's the Stanley Cup!?'

HOCKEY SMACK TALK!!!!

President Barack Obama stuck it to Canada this morning ... hitting the Prime Minister over the subject that hurts the most -- HOCKEY!!!!

Obama was with P.M. Justin Trudeau at the White House talking about things the two countries will never agree on. One of those things ... who's better at hockey.

When Trudeau sniped, "Don't get me started" ... Obama replied, "Where's the Stanley Cup right now?"

"I'm sorry, is it in my hometown with the Chicago Blackhawks?!"

BOOOOOM!!!!!!!