An insult focused on hurting someone that is deflected easily or has lost it’s meaning because either that person doesn’t care, is what you are describing, or the roast/insult just makes no sense and sucks.
Here are some examples:
Moron: Hahaha you are a nerd. Probably Asian
Smart kid: I am Asian?
Moron: Oh ok
Smart kid: That was unsulting
Moron: Whats that me-
Smart kid: FUCKING GOOGLE IT MORON
Example 2:
Teammate on CoD MWF: Ur gay
Gay person: And? What about it?
Salty kid: You are a... uh.... uhhhhh. Moldy stick!
Other salty kid: What does that even mean you fucktard?
An undulating kiss is a kiss performed by moving from side-to-side or back and forth , more like an intense french kiss that might go even more sexual if its going up and down you get what i mean?
"An undulating kiss is what i need right now" said the professor looking at the girl titled teachers's pet...