Here's video of Hassan Whiteside that's gonna make you all gooey with the fuzziness inside ... the Miami Heat star surprising his mom in the most awesome way ... WITH A BRAND NEW HOUSE!

Whiteside pulled off a pretty elaborate ruse on his mother ... pretending they were just showing up to the 6 bedroom home in Charlotte, North Carolina for a viewing, then springing the keys on her at the end.

Mom's reaction? Priceless.

She busts out a little dance in celebration while another member of Whiteside's family literally flips -- (watch the video, she actually flips with excitement).

BTW, Whiteside recently signed a 4-year $98 million deal with the Heat -- so we're betting this isn't the last time mom will get hooked up ... and she deserves it.