The male genitals.
Females have Wobbly bits, Males have Dangly bits.
This term refers to the cock and balls which dangle between a males legs. Although not very common it is possible for a female to have dangly bits. This happens after being violently fucked to many times and parts of the vagina become torn loose and dangle freely between her legs.
I wear tight underwear so my dangly bits don't slap against my legs when I run.