1. [late 18C+] (orig. US, also buddie) a form of address to a male.
2. [mid-19C+] (orig. US, also buddy-cat, buddy-roo) a friend, an acquaintance.
3. [1970s+] (W.I./UK black teen) a sexual partner.
4. [1990s+] (US/W.I.) the penis.
[1940s+] (US) an affectionate or ironic term of address.
[1950s+] (orig. US) a friend, usu. in a negative or ironic use; esp. as a term of address.
see sense 2 above.
[1930s–60s] (US black) a friend, a man.
[1940s–60s] the pillion seat on a motorcycle.
[2000s] (US gay) hedonistic sexual intercourse without committment.
see fuck-your-buddy week under fuck v.