expression
fully prepared; all ready
Slang expression combining 準備万端 (fully prepared) with 満タン (full tank), implying readiness is at maximum. Playful and casual.
See also: 準備万端
旅行の準備満タン！いつでも出発できるよ。
I'm fully prepared for the trip! I can leave anytime.
試験対策は準備満タンだ。
I'm all set for the exam prep.
Means 'full tank' (e.g., gas tank). Used in the pun to suggest maximum readiness.
A pun blending 準備万端 (fully prepared) with 満タン (full tank), implying preparation is at full capacity. The exact origin is uncertain, but it is a modern slang coinage.