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:...
by the will burchfield August 15, 2006
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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!
by Master Tonberry March 13, 2005
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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
by Lee Holland September 20, 2003
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