xertainly 

Extremely certain. Extra certain. Cocksure. More than just assured of a concept.

Jim: That bacon is xertainly delicious.

Bob: DAMN SKIPPY!

xertainly by NoseGuy February 27, 2009

They are most certainly not delicious! 

A line said by SpongeBob when he and Patrick were walking by a billboard advertising Barnacle Chips.

Patrick: Eat Barnacle Chips. They're delicious.

SpongeBob: They are most certainly not delicious!

They are most certainly not delicious! by Master Tonberry March 13, 2005

CertainlyT 

CertainlyT is a shitty Riot developer who does not know what a fair or balanced champion is.

CertainlyT

Created: Yasuo, Thresh, Zoe, Darius, Kalista, Zyra, Warwick

Reworked: Mordekaiser, Graves, Caitlyn, Akali

CertainlyT by AsianGuy0 November 2, 2018

certainly 

certainly is one of those words that makes you sound exponentialy more intellegent that you really are. it is very much like "indeed" in it's usage and effect. Works best if you put the word "well" or "why" in front of it, and if you use "truly?" as a question.

Joe: hey did you read that chapter in history?

you: why certainly winstin.

joe:...

certainly by the will burchfield August 15, 2006

why certainly dear 

a statement of agreement when u cant be arsed saying anythin else, also can be used as sarcasm

person: hello lee

Lee: why certainly dear

why certainly dear by Lee Holland September 20, 2003

certainly gaurented 

To be sure

You are certainly gaurented

certainly gaurented by DarthQuantum June 13, 2017

Certainly Gay 

the opposite of no homo

I wanna get spanked by my male improv friends, but certainly gay.

Certainly Gay by brendans homie December 24, 2018