Used to describe any untimely or unnecessary expenditure of effort or money.
Adapted from Shakespeare (Merchant of Venice), and in that day roads were in far better shape during the summer months, so mending roads in summertime was considered redundant.
Guy 1: "I'd better review for my phsychology exam"
Guy 2: "Study for a class that easy? That's like mending roads in summertime!"
The act of taking a man to one's bed. Usually used in reference to a series of one-night stands.
Sorry I've been out of contact I've been too busy mening, it wouldn't take up as much of my time if I didn't have to wake up next to some stranger the next morning and go through the whole brunch and awkward conversation routine.