It can also be used when trying to inform someone sex has recently been performed.
Person 1: "Aye, am goin te his the night. Actually canny wait man, its been too long!"
Person 2: "Oh! Ye think you'll be getting yer ham jam the night then?"
Person 1: (winks) "Oh Aye man."
Person 2: (immediantly grins) "Yaaaas."
Example Two (when used to inform)
Person One: (raises eyebrows) "Here, by ra way, ham jam"
Person Two: (laughs out loud) "Yaaaaas!"