Someone who is too serious. Substitute tightarse for serious.
Nigel is tightarse.
Screw you, tightarsely!
I love tightarse people.
Baby talk for the word baby. Bubz is a shortened version
Girl: i've had a awful day at work
Boy: Aww bubba, what happened?
Use as a substitution for serious.
Nigel is tightass.
This is a tightass situation.
-lead singer of what can be classified as "nerdy pop-rock" band Weezer
-hot Geek with strangely attractive sunglasses
Why do I like Rivers? He's hot. And he looks like my boyfriend. And I like nerdy looking guys. And did I say he's hot?