Colloquial term for a protruding belly, often associated with heavy beer drinking.
最近ビール腹が気になってきた。
I've been getting self-conscious about my beer belly lately.
彼は毎日ビールを飲むから、すっかりビール腹だ。
He drinks beer every day, so he's got a real potbelly.
Compound of ビール (beer) and 腹 (belly). A straightforward descriptive term.