A tool or technique that makes some aspect of a mom's life easier or more efficient.
Mom tricks to save money and/or time.
Putting your child's pants, socks, and shoes on him while he is buckled (restrained) in his highchair and eating his breakfast is a classic momhack.
On Saturdays, I take my kid to the pet store and toy store and let him look and play, but I don't buy him any pets or toys. Another great momhack.