The act of masturbating to My Little Pony porn, a term usually used by the brony fandom.
Person 1: *fap fap fap fap fap fap*
Person 2: hey what's going on he-JESUS CHRIST ARE THOSE HORSES?! WHAT THE FUCK?!
Person 1: Uh... um.... I was just, er.... clopping?
Person 2: ...I appreciate the honesty but still what the fuck.
The term used for when a female goes to the toilet post sexual intercourse, implying the action of when the males ejaculation ''cum'' falls out of the vagina in clumps making a plopping noise when it reaches the water in the toilet bowl.
Babe, that was wonderful however i must vacate to the toilet to urinate and conduct a spot of ''clopping''.