1. a jelly-like substance, especially a gel used in hair styling or cosmetics
Usage: informal; chiefly North American
2. gelignite; a type of explosive
Usage: British slang; dated

Examples

• He applied gelly to his hair before styling it.
• The gelly gave his spiky hairstyle a strong hold.
• She used a light gelly to add shine without making her hair greasy.
• The product is a clear gelly that works well for all hair types.