"Just the tip" means just the tip of your cock goes in your girls pussy when your trying to get laid.
"Come on, just the tip, just for a minute, just to see how it feels."
Quick finger is using your finger to stop an unwanted incoming call on your phone.
When pirate hookers,husbands,wives,stockers,crazy drunken whores or anyone else you don't want to talk to calls you "quick finger" their ass!
