1. reached or exceeded the maximum limit or capacity of something
Usage: informal; past tense and past participle of 'max'
2. used up or exhausted a credit limit, account balance, or resource completely
Usage: informal

Examples

• She maxed out her credit card on the shopping spree.
• He maxed his retirement contribution for the year.
• The server maxed out at 10,000 concurrent users.
• I maxed out my phone's storage with photos and videos.
• The athlete maxed her performance during the final sprint.
• They maxed the volume on the speakers for the party.