Defiantly ≠ Definitely

According to Merriam-Webster.com:

de·fi·ant: full of or showing defiance : bold, impudent <defiant rebels> < a defiant refusal>

def·i·nite: 1: having distinct or certain limits <definite standards for pupils to meet> 2a : free of all ambiguity, uncertainty, or obscurity <demanded a definite answer> b : unquestionable, decided <the quarterback was a definite hero today>

Therefore, "OMG, I am so defiantly there!" has a much different meaning than "OMG, I am so definitely there!" Mmmkay?

*end rant*