"Teen Mom 2" star Kailyn Lowry's ready and willing to get in the ring with Farrah Abraham and open a can of whoop ass ... but Farrah's first gotta say yes, and she might wanna think twice.
Damon Feldman -- the guy who set up a charity boxing match Farrah backed out of -- tells TMZ Kailyn's set to sign a deal with his company Friday for a charity match ... with proceeds going to charity. And, Kailyn's making no bones about it -- she wants Farrah.