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du seist

are

z a ɪ̯ s t → sein
sei be + st du-form present subjunctive
verb · 2nd-person singular, present tense Rare #46,490
are Used in reported speech; it is the subjunctive form of “sein.”
GE: Sie sagt, dass du müde seist.
EN: She says that you are tired.
Conjugation of sein
Subjunctive present
SingularPlural
First sei seien
Second seist seiet
Third sei seien

Seist es.

Be it so.

— Kin-Dza-Dza (1986)

Tom sagte, daß du interessiert seist.

Tom said you were interested.

Hat dir schon mal jemand vorgeworfen, dass du eingebildet seist?

Has anyone ever accused you of being conceited?

Sie sagte mir, daß du krank seist.

She told me that you were sick.

Sounds similar to

weißt v a ɪ̯ s t meist m a ɪ̯ s t weist v a ɪ̯ s t