macho

Short definition from Wiktionary

Adjective

1. 1
   Masculine in an overly assertive or aggressive way.

Noun

1. 1
   A macho person; a man who is masculine in an overly assertive or aggressive way.
2. 2
   Machismo
3. 3
   The striped mullet of California (Mugil cephalus, syn. Mugil mexicanus).
4. 4
   A male llama.
5. 5
   Initialism of massive astrophysical compact halo object.