A more thorough explanation:

Definition: degaster (day-gas-tay), vb.[fr. Old French dégaster “to spoil”] To waste.

Examples:

• He degastered his money on useless things.
• She degasters her time watching TV instead of studying.

The examples illustrate the definition of degaster, which means to waste. In the first example, the person wasted their money on things that were not necessary or useful. In the second example, the person wasted their time by watching TV instead of using that time to study. Both examples show how degaster means to use something in a way that is not productive or beneficial.