Green’s Dictionary of Slang

fam n.2

[abbr.]

1. (US black/gay/teen) the family.

[US]B. Rodgers Queens’ Vernacular 79: fam 1. family ‘Maybe I’ll go straight someday and raise me a fam.’.
[US]Shaquille O’Neal ‘I’m Outstanding’ [lyrics] If they can’t say Shaquille O’Neal then make ’em scream, ‘Shaq!’ / Like the fam’ do, in the stands who / When I freak the funk on a dunk they, ‘Ahhh! Oooh!’.
[US]Source Aug. 100: How did it affect your fam when you were getting into so much trouble?
[US]S. King Finders Keepers (2016) 254: Her big brother was really the one sending cash to keep the fam afloat.
[UK]A. Wheatle Crongton Knights 2: The social services offered Bit’s fam a flat.

2. (US gay) a large number [ext. of sense 1].

[US]B. Rodgers Queens’ Vernacular 79: fam [...] 2. the whole shebang; a bunch.

3. used as term of address to a friend.

[US]G. Hayward Corruption Officer [ebk] cap. 39: ‘Yo, Gee, what’s good? I need you, fam’ [...] I responded, ‘Say no more, I got you, fam’.
[UK]Independent 5 Jan. [Internet] Many other [teenage] words belong to MLE—multi-ethnic or multicultural London English— [...] Among the most pervasive are bruv, mate, bare, fam, gwop, or peas (money), and chirpsin’, linkin’, and lipsin’—flirting, dating, and kissing respectively.
[US]C. Eble UNC-CH Campus Sl. Spring 2016 4: FAM — < family close friend, family member: ‘Hey, fam, I missed you over break’ .
[UK]Skepta ‘Corn on the Curb’ [lyrics] Mad pressures from every angle, fam.