Calvin Harris Taylor's a Big Joke!

6/17/2016 1:57 PM PDT

Calvin Harris -- Taylor's a Big Joke! (VIDEO)

Calvin Harris will take Taylor Swift back ... when rocks grow.

The DJ zinged his ex Friday afternoon outside a WeHo gym ... the same place he cleverly threw shade the day before, with an assist from Kanye and his Yeezys.

By the way ... check out Friday's shoe selection -- same brand ... in black.