When you a person not to tell a person about something but you really want that person to know (without eagerness). A loaded secret is meant to help you in a backward behind way.
(A story about Tim, Jake, and Emily)
JAKE TO TIM: Don't Emily this but I think she's hot
TIM TO EMILY: Jake said you were hot but that's a secret so don't say anything.
EMILY TO JAKE: Tim said you had a crush on my
JAKE TO EMILY: That was supposed to be a secret but how does that make you feel.
EMILY TO JAKE: I think your hot too so let's make baby's
JAKE TO TIM: Hey thanks for telling Emily that was a loaded secret so I wanted her to know the whole time.