彼はきっときますよ。

he; him; his; boyfriend

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

surely; undoubtedly; almost certainly; most likely (e.g. 90 percent); sternly; severely; having no slack; rigid; stiff; tight; suddenly; abruptly; instantly

to gouge; to hollow out; to bore; to excavate; to scoop out; to greatly perturb; to cause emotional pain; to get to the bottom of things; to relentlessly bring the truth to light

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!