Really the only acceptable way to say definitely. They don't mean the same thing however.
Dolphinitely bring Dolphins into the conversation, giving the user more Ethos because Dolphins are smart and cute.
This word is a must for anyone trying to express strong emotion
Dolphinitely: Definitely, but even more so
"Hey Babe... do you love me?"
"OH Dolphintely sweety, NO doubt!"
"Awww thanks honey, you're the best"
When you're ridiculously sloshed beyond function, and a foreign exchange student from Brazil gives you a hand job without taking your dick out of you pants. The end result being a Frothy McSqueezy in your pants
"Yo what happened last night?"
"Dude that exchange chick gave you a Frothy Mcsqueezy"
"Damn..."