Definition of begathon in English:

begathon

Pronunciation /ˈbɛɡəθɒn/

noun

(also beg-a-thon)
informal US
  • A disparaging or dismissive term for: a fundraising event that is considered to be overextravagant or unduly prolonged, typically one broadcast on television or radio.

Origin

1970s; earliest use found in Cherokee (Iowa) Daily Times. From beg + -athon.