noun
loyal customer; frequent visitor
Wasei-eigo from English 'heavy repeater'; used in business and casual contexts for someone who repeatedly uses a service or visits a place.
wasei-eigo (Japanese-coined English), from heavy repeater
あのカフェはヘビーリピーターが多い。
That café has many loyal customers.
彼はこのサイトのヘビーリピーターだ。
He is a frequent visitor to this site.