Definition of sausage party in English:

sausage party

noun

informal
  • An event or group in which the majority of participants are male.

    ‘ignore the RSVP list as it looks like a sausage party’

Origin

Mid 19th century (in the sense ‘event at which sausages are served’): from sausage + party, with allusion to the supposedly phallic shape of a sausage.