Wiktionary
tighty whities
alt. (context informal English) Men's briefs; underwear. n. (context informal English) Men's briefs; underwear.
Usage examples of "tighty whities".
The slacks slid down and pooled at Dave's feet, leaving Dave standing there in his tighty whities.
They get what they want and then next thing they got their tighty whities in their pocket and they're out the door.