weaving in ends

a passage in one of my favorite knit lit books described the main character's technique in weaving in the ends of her work.

kelly took the yarn and buried the split ends in her work  (loosely paraphrased here)

i am assuming her yarn was multi ply, if she buried 3 or 4 ends into her work.  and obviously, you can't divvy up a single ply yarn.  

now, when i weave in my ends, i don't split the plies.  i just weave in the yarn, usually in a zig zag pattern.  sometimes, if there isn't a lot of room and i have a lot of ends to weave in, i weave my end in a circle.

how do you weave in your ends?