To relieve a dear friend of something they no longer need.
"Thanks for the wallet, mate. Yoink"
when pulling something unexpected out of somwhere unusual.
picture the scene: Amsterdam, a seedy strip club. I'm pulled onto the stage and the dancer begins to take her clothes off. When she's naked she lays me down and begins to gyrate over my body. She finishes and I stand up to find the word's "I'm so sexy" written in indelible ink on my torso. As the lithe young blonde pulls the pen out of her vagina she puts her arms around me. She pulls my half nake body onto hers and whispers in my ear "yoink"