Hahaha. It does look a bit like the N word doesn't it? The "sn" is about what you'd expect, like in "snail". To make the Y sound, start of with making an "e" sound, like in "easter" or "eating", and while making that sound, make an "o" shape with your mouth, like you're saying "oh", then you get a rough approximation of the "Y" sound. It's a rather nasal sound!

The "gga" is about what you'd expect too. Avoiding the obvious n-word, think "gold digga" instead, no rhotic vowel like in "digger" but "digga."