"No wuckas" is an abbreviation for the term "no wucken forries". "Wucken forries" is a spoonerism of the term "fucken worries". In any form this term is usually followed by the address "mate".
A: "hey mate do you have a spare smoke by any chance? "
B: "yeah sure, here you go mate"
A: "thanks heaps, mate"
B: "no wuckas, mate"
Wugasm (noun) - To have a wugasm is to enjoy a state of elation upon odd moments where you would not normally feel sensation or have a moment of climax.