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Well that is a good start, you have to get comfortable with using the word and voice inflection. With a new word like guzbucked, does a person go hard on the "guz" and softer on the "bucked"? I think it depends on the person and the sitiuation. It could also be reversed where a soft "guz" and hard "bucked" might be appropriate. Also a quick nod of the head as you say the word also gives added expression I have found, so you might even work that in as you practice, a mirror works well for that.
Once you get comfortable with the word, voice inflection and the body language I'm sure you will guzbucking folks left and right when they deserve a good guzbuck directed their way.