Tongue pulls back slightly from the D position, blending into R. Sounds close to 'jr'.

Americans pronounce drummer as DRUH-mer (/ˈdrʌmər/). In "drummer", the "dr" cluster blends into a "jr" sound — a natural American English pronunciation. This is called the DR Sounds Like JR, and it's why Americans sound more relaxed than the textbook. It comes out as DRUH·mer. Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "The drummer keeps the beat steady throughout the performance".
Record yourself saying "drummer" and play it back. The mic stays on your device — nothing's uploaded.
2 syllables, 5 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
Tongue pulls back slightly from the D position, blending into R. Sounds close to 'jr'.

Curl or bunch your tongue without letting the tip touch the roof of your mouth. Brace the sides of your tongue against your upper back teeth, and round your lips slightly.
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
The textbook way isn't wrong — it's just not how anyone actually says it.
In "drummer", the "dr" cluster blends into a "jr" sound — a natural American English pronunciation. /d/ shifts toward /dʒ/ ("j"), so DR sounds like "jr".
Stress falls on the first syllable, not the others. Stretch DRUH — keep everything else short and quick.
Americans use a relaxed retroflex R — the tongue curls back rather than rolling. The R is one continuous sound with the vowel before it, not two separate sounds.