From Wiktionary, the free dictionary
From leuk (“calm, level-headed”) + -weg (“-ly, -wise”).
leukweg
- laconically, drily, nonchalantly, without caring, simply (with connotations of impudence)
- Synonyms: doodleuk, leukjes
- Hij hing de telefoon leukweg op. ― He simply hung up the phone.