| 1 | English | buttfuck | An act of anal intercourse; To perform an act of... |
| 2 | English | butt | The larger or thicker end of something; the blunt... |
| 3 | Middle English | butten | — |
| 4 | Anglo-Norman | buter | to strike, finish |
| 5 | Old French | boter | to push, butt, strike; to strike; to push; thrust |
| 6 | Old French | bouter | to strike; to hit; to place; to put; to enter |
| 7 | Frankish | bautan | to push, strike, beat; to hit, strike; to hit,... |
| 8 | Proto-West Germanic | bautan | to beat |
| 9 | Proto-Germanic | bautaną | to beat, push |
| 10 | Proto-Indo-European | bʰewd- | to hit, strike; to beat, push; to strike, push,... |
| 11 | Proto-Indo-European | bʰew- | to grow, swell; to swell, wax, grow; to blow; to... |