When a male has an erection, usally in the morining when waking, he takes his penis and folds it back, tucking it up so the boxers elastic waistband keeps it tucked up tightly against his stomach. Thus keeping the erection from being seen.
"Thank god for the tuck and fold cause my friends would of seen my tiny wang"
The tuck and fold occurs when a guy takes his cock and balls and puts them under and between his legs, giving the illusion of just pubic hair as if he were a woman.
I couldn't tell she was a he because of the perfect execution of the tuck and fold.