1. of a high level of beauty; desribing someone you would like to tuck in to. Adj.
2. of a high enough level of promiscuity as to be considered easy to tuck in to. Adj.
"Dude, I fully wanna tuck in to Sophie tonight, she's bang tidy."
"Yeah man, she's tuckable"
"Anyone could have a go on Katie if they wanted, she's easily tuckable"