1. most slouching in posture; having the worst posture or most relaxed, drooping stance
Usage: superlative form of slouchy
2. most loose-fitting or baggy in appearance
Usage: informal; describing clothing or style

Examples

• He had the slouchiest posture of all the students in class.
• She wore the slouchiest sweater she could find for the lazy Sunday.
• Among all his friends, Jake was the slouchiest when sitting on the couch.
• The slouchiest hat in the store was exactly what she wanted.
• His slouchiest jeans were perfect for the casual weekend.
• The teenager had the slouchiest walk down the hallway.