Throw firewood

An action that describes a made-up prior engagement in order to dodge duties, plans, or other activities solely because you really didn't want to, but wanted to spare feelings. Made popular in Skyrim where some quest givers may ask of you a menial task and you respond with an equally menial task in order to exit conversation so you can come back and get it later if wanted.

You: "Hey, want to go bowling?"
Person: " I cannot as I have to Throw firewood later."

throwing some firewood

A flimsy excuse for bailing on your friends. This does not mean that the actual act of cutting or stacking firewood does or does not occur however. It can also be an excuse for why you failed to perform a specific act or function.

Yeah, Jeezy was supposed to come bowling but he said he was busy throwing some firewood.