also: マックる
godan verb (-ru), intransitive verb
eat at McDonald's
Casual slang used mainly by young people. Often implies a quick, informal meal.
今日の昼、マクろうよ。
Let's grab McDonald's for lunch today.
昨日はマクってからカラオケに行った。
Yesterday we ate at McDonald's and then went to karaoke.
The full brand name; マクる is a verb derived from it.
Derived from the brand name マクドナルド (McDonald's) by shortening to マク and adding the verb ending る.