Best definition
weight check
a verbal request and implied challenge to use heavier weight on exercise apparatus (i.e. a bench press or squat rack)

in an over-crowded gym to gain sole usage of the respective equipment.

Tron walked into the gym wanting to bench press, however, all of the benches were full. Luckily for Tron, there was mad weak-sauce on one of the benches. Tron approached the low-life weak-saucer and issued a weight check. Having successfully lifted an exponentially larger amount of weight, the weak-saucer had no choice but to call off troops and recede to a corner to accept his shame.