Here is an amusing expression. When you want someone to do something straight away, without wasting time, go straight home, don't take a detour or waste time on the way to look at flowers, this is what you can use (in the negative of course).
Reading: michikusa wo kuu
Meaning: to loiter (on the way); to waste time
Literally: eat the grass on the side of the road
Somehow, this makes me imagine a cow standing on the side of the road, chewing on some grass, and this amuses me. Sue me.