Short for コテハン (kotehan).

to pile up, to heap up / to enliven, to stir up

chat on the Internet

Internet chat

to use / to employ / to make use of, to apply / to spend

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

cybersex

Super Chat (YouTube function)