George Lopez -- I Can't Hold My Liquor -- My Party Days Are Over

George Lopez says Latinos are excellent drinkers who can really hold their liquor -- but he's not one of 'em -- telling TMZ his drunken debacle at a Canadian casino has convinced him to give up the hooch.

We got George outside Howard Stern's show this morning in NYC ... and when we asked about his arrest for public drunkeness in a Canadian casino last month he said he hasn't touched a drop since. No weed either.

But listen to the clip ... 'cause George seems to think TMZ holds the key to his sobriety.