Definition of chemsex in English:

chemsex

noun

mass nounBritish
informal
  • Sexual activity engaged in while under the influence of stimulant drugs such as methamphetamine or mephedrone, typically involving several participants.

    ‘the majority of interviewees had a history of recreational drug use prior to becoming involved in chemsex’
    as modifier ‘a three-day chemsex party’

Origin

Early 21st century: blend of chemical and sex.

Pronunciation

chemsex

/ˈkɛmsɛks/