If she doesn't know you well and like you a lot, then "angry" is probably the best description.
Yes
That she is ticklish.
Get her consent first.
When your kissing (usually making out) slip your hand down to her waist and when you feel its the right time grab it!
Grab 'em and run!
not a good idea If you're sure she'd feel comfortable with it grab away. If you're not sure and you're in public you might want to avoid that. Best idea is to whisper in her ear "I wanna grab your butt" and gauge her response. :)
It's important to ask for and respect consent before touching someone in any way, including grabbing their butt. Make sure the person feels comfortable and is willing before making any physical advances. Remember that consent is key in any type of physical interaction.
grab his butt
if you have big boobs, good stomach, little over average butt, and if you have a sexy face. another reason to have big boobs is that he can grab them during sex so more pleasurable time for a girl. its also good for him to feel. that also a reason for the butt. for him to hold onto it. have a good time sex!!!!!
Bribe him or tell him too...if he agrees
No, it is inappropriate.
means he likes you!