Trump's feeling really good about Weezy's endorsement ... outside the White House Friday morning he said Wayne's a "really nice guy" and "an activist in a very positive way."

Wayne's been called a lot of things due to his enormous success in the music biz, but activist is definitely not one of 'em.

As you know ... Tunechi met with POTUS Thursday, sharing a photo of them grinning together and giving a thumbs up. Weezy says he's endorsing Trump because of his track record on criminal justice reform, and says he's a fan of Trump's Platinum Plan.

Remember, Ice Cube worked with Trump's camp on the plan, which vows to pump $500 BILLION into Black communities while providing better access to jobs and education.

Trump says Wayne asked for the meeting and he obliged ... and he seems more than happy with Weezy's endorsement.

Wayne's already drawing criticism for the meeting, which came 5 days before Election Day. 50 Cent, who previously endorsed Trump because of taxes before changing course, ripped Weezy for the Trump photo op.

Lil Wayne, Weezy, Weezy F. Baby, Tunechi, Weezyana, Lil Tune, Birdman Jr., President Carter, Mr. Carter, Dr. Carter, BM Jr., Young Weezy -- all monikers we've heard, but Lil Wade???