Abbreviation. "First, During, Last".
An initialism signifying the ideal stage during which a woman or otherwise uterine sexual partner experiences orgasm during sex
"Always remember the FDL rule: She cums First, she cums During, she cums Last."
a law of brotherhood: friends dont let friends fuck fat chicks. especially in times of drunken pandemonium, a friend who follows this man-law is a friend indeed
Jack: damn, i cant believe mike tagged that cunt shaniqua last night... that bitch is huge!!!
Daniels: yeah, too bad his friends didnt know about the important principle of FDLFFFC...
Person1: Hello?
Person1: Where did you go?
Person1: Why did you stop talking?
Person2: fdlJUVKL;SS<Da
Person2: Sorry, i was watching a video... i mean.. an art film.