Tory Lanez says Tunechi was on set to help out with his music video for "Big Tipper" the very next day after Trump pardoned the rapper in his federal gun case.

In the clip Lanez shared, Lil Wayne's in a hot pink getup, flashing serious ice on both wrists, smoking and vibing to the music. Oh, and that's all with a nude model in front of him on a table.

As we reported ... Weezy was facing serious time behind bars after pleading guilty in federal court last month to illegally possessing a loaded weapon on a private jet.

Trump's pardon -- on the heels of Wayne endorsing Trump for President -- let him off the hook for all that, though ... which cleared his schedule for music vid shoots like the one with Lanez.

Tory gushed with all sorts of appreciation for Weezy coming through for him ... after Trump came though for Weezy.