When a male ejaculates on the chest of his partner, the male then mounts the his partner, using the semen as a lube to slide against his partner while pumping his fist and making the sound train whistle.
NOTE- Ejaculate can be interchanged with fecal matter. This is called Charlie's brown line.
Brandon Cho Cho Charlied nick so hard last night he gave him a bloody nose.
Man nick left skid marks on my chest last night after he Cho Cho Charlie me.