er is'n

is (then), is a, is an

→ sein
is he/she/it is + 'n a, an
verb · 3rd-person singular, present tense Rare #47,539
is (then) Colloquial spoken contraction of ist denn; denn often adds emphasis or curiosity and has no direct English equivalent.
GE: Was is'n hier los?
EN: What's going on here?
is a, is an Colloquial spoken contraction of ist ein.
GE: Das is'n guter Plan.
EN: That's a good plan.
Conjugation of sein
Indicative present
SingularPlural
First bin sind
Second bist seid
Third ist sind

Wo is'n das Café?

Where’s the café?

— Victoria (2015)

Wer is'n das da, Ali?

Who’s that over there, Ali?

— Ali: Fear Eats the Soul (1974)

Das is'n anderer Typ.

That’s a different kind of guy.

— Bacurau (2019)

Was is'n das?

What’s that?

— Django Unchained (2012)