"Thrussy Bussy" is a complex word that can be used in many circumstances.
The Breakdown:
Thrust is a word often used to describe a powerful motion in a particular direction. In that word specifically it is used to compose the first word (Thrussy) and is being used in a sexual conation.
The "Bussy" half is more complicated. "Bussy" could either mean a bus, man bussy or just mean busting in general.
If I were to narrow it down to 1definition it would be:
Verb: The act of thrusting the proceeding to bust
Adj: A way to describe an object that is goodat thrusting and busting
Noun: An object that is highly skilled at thrusting and busting
Verb: "Bro I just hit a crazzy thrussy bussy in this dude"
Adj: "His throbbing cock was really thrussy bussy"
Noun "He gave me his thrussy bussy"
A sex kink when a female is on her period. The guy sticks his dick in her vagina pulls it out with her blood on it and quickly shove it down her throat. Leaving her with a bloody throat.
Last night my sluncle gave me a rusty thrussy and I have never been move in love with the taste of his dick.