noun

• (exercise) Any of various modes of callisthenic exercises performed by moving the body and bending at least one knee.
• (exercise) Any of various modes of callisthenic exercises performed by moving the body and bending at least one knee.
  "The king of all quad exercises, and arguably the best single-weight resistance exercise, is the squat."
• (slang, Canada, US) Clipping of diddly-squat; something of no value.
  "I know squat about nuclear physics."
• (mining) A small vein of ore.

verb

• (exercise) To perform one or more callisthenic exercises by moving the body and bending at least one knee.
• (exercise) To perform one or more callisthenic exercises by moving the body and bending at least one knee.
  "For those who are having, or have had, trouble squatting we suggest learning how to squat by performing the front squat […] The front squat allows you almost no alternative but to perform the exercise correctly."
• (dated) To bruise or flatten by a fall; to squash.
• (Internet) To cybersquat.
  "The old homepage for L2TP, www.l2tpd.org, has been squatted by a domain squatter. A malicious person could reinstate this domain with malicious code on it."