ゴチる

Meanings

1

godan verb (-ru)

treat someone; pay for someone's meal

slang

Slang verb used among friends to mean treating someone to a meal or drinks, often with a casual, generous feel. Derived from ごちそう.

ごちそう
ごちそう is the noun meaning 'feast' or 'treat', while ゴチる is the slang verb form meaning 'to treat someone'.
おごる
おごる is the standard verb for 'to treat someone', while ゴチる is a more casual, slangy alternative.

Slang verb derived from ごちそう (feast/treat), with the suffix る added to create a godan verb.