This is the 10974th most frequent German word.
schlecker
"Schlecker" in German refers to someone with a sweet tooth or someone who enjoys sweets.
In this sentence, 'Schlecker' colloquially refers to someone who enjoys sweet treats.
Er ist ein echter Schlecker und liebt Süßigkeiten.
He is a real sweet tooth and loves sweets.
Here, a form of 'schlecker' as 'schleckt' is used as a verb meaning 'licks'.
Die Katze schleckt die Milch aus dem Napf.
The cat licks the milk from the bowl.
In this case, 'Schlecker' is used as a noun referring to a type of ice cream that you lick.