To brag about something without putting the emphasis on the brag itself, often in the context of a bigger story.
Joe: So last night after fucking 2 girls I made a cheese sandwich. Do you like sandwiches too? Man I love cheese sandwiches.
Mark: Dude, that's such a stealth brag.
Mark: Dude, that's such a stealth brag.
by PJNL March 23, 2010