I got like 3 grams of weed that stayed in the grinder a little too long (Dust) could i just throw in like a gram of it into some jelly and put it on a piece of toast and get high?
More than likely not. You see, the THC in marijuana must first be transformed into a psychoactive form that is usable by your body via a process called decarboxylation. This is carried out when the bud is heated past a certain point, usually accomplished by lighting your bowl with a lighter or by the oven in baking.
However, if you're dead set on mixing some herbs with your jelly, you can simply place your buds in the oven for a few minutes prior to consuming them.
I like to mix about a tablespoon of some really well ground up on bread, spread real butter over that mixing them together as I spread and then I sprinkle about a tea spoon of jello (usually lime) powder on top of that.
I fairly sure that if you make toast, Put peanut butter on it. Then sprinkle a bit of weed over the toast. Nuke it in the microwave for five seconds that should work.