like is a word where the use/meaning has extended a lot; especially among younger. In many cases it doesn't really have a meaning and is more of a verbal tic.
shorted me like .2 grams on an eigth - like has no meaning here. It's just a verbal tic. shorted me .2 grams on an eighth. He undersupplied me by .2 grams on my eighth of an ounce.
hes like No don't come in. A common new use of like - he said 'No, don't come in.'