What does “Off the top of one's dome” mean?

Off the top of one's dome

Meaning: From memory, without preparation or thinking too much.

De memoria

Significado: De memoria, sin preparación o sin pensar demasiado.

De cabeça

Significado: De memória, sem preparação ou sem pensar muito.

À vue de nez

Signification: De mémoire, sans préparation ou sans trop réfléchir.

Aus dem Stegreif

Bedeutung: Aus dem Gedächtnis, ohne Vorbereitung oder großes Nachdenken.

A occhio e croce

Significato: A memoria, senza preparazione o senza pensare troppo.

Aklıma geldiği kadarıyla

Anlam: Ezberden, hazırlıksız veya çok düşünmeden.

随口说说

意思: 凭记忆，没有准备或没有多想。

即座に

意味: 記憶から、準備なしまたはあまり考えずに。

즉석에서

의미: 기억으로, 준비 없이 또는 너무 생각하지 않고.

Dialogue

10:15:05 - Do you know the exact population of the city?

10:15:09 - Off the top of my dome, I'd say it's around two million.

10:15:14 - Are you sure? I think it might be higher.

10:15:18 - I could be wrong. Let me check the latest census data to be sure.