This is the 10462nd most frequent Swedish word.
klägg
"Sticky or gooey substance."
Here 'klägg' refers to a sticky or gooey substance that affects the texture of the sandwich and can sometimes denote something unpleasantly adhesive.
Kläggen på mackan gjorde den svår att äta.
The sticky substance on the sandwich made it difficult to eat.
In this sentence, 'kläggade' as the verb implies applying something in an unprepossessing or careless manner, often in an excessive or thick way.
Han kläggade på färgen utan att fundera på jämnheten.
He smeared on the paint without considering the smoothness.
Here 'klägg' illustrates the resulting mess comprised of sticky or liquid remnants, showing its usage to describe a physical state that could be challenging to clean up.