sticky ass
When your underwear goes into your ass crack and you have a hard time pulling it out. It gets stuck in there because of poor wiping.
guy 1: My underwear is stuck because I have a sticky ass. guy 2: Man you need to start using wet wipes.
Full ass sticky back
When you put your balls up someone's ass but leave your dick out so you can jack off on their back.
:oh man Why's your shirt all wet?
:Someone stuck their balls up my ass but left their dick out so they could jack off on my back.
:That sucks, you got a full ass sticky back
:Someone stuck their balls up my ass but left their dick out so they could jack off on my back.
:That sucks, you got a full ass sticky back