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buckRegional drug slang
To shoot someone in the head.
1. adult male goat. Unlikely to be kept for any purpose other than an active breeding life, and then only at a distance.
2. breeding male of most small, wild ruminant species, including roe, fallow, muntjac and Chinese water deer. In larger deer species is called bull.
3. the violent actions performed by a horse attempting to dislodge a rider. In rodeo contests steers and bulls may also be engaged in riding-bucking contests with human riders.