Big Sean Rolls Out The Motown Gravy Train For Thanksgiving (VIDEO)

Big Sean just backed up his holiday truck and emptied it on Detroit Tuesday morning ... with 1,000 turkeys.

Sean surprised students at River Rouge High School by handing out turkeys, corn, green beans and sweet potatoes ... then followed it up with a speech to the kids about the importance of giving.

It's the second year Sean's thrown the event, courtesy of his charity, the Sean Anderson Foundation ... and this time he upped the ante by throwing in all the fixins.