From The Collaborative International Dictionary of English v.0.44 [gcide]:
2. A person who has social intercourse with others of many sorts; a person viewed as to his casual sociability; -- commonly used with some characterizing adjective; as, a good mixer; a bad mixer. [Colloq. or Slang, U. S.] [Webster 1913 Suppl.]
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
61 Moby Thesaurus words for "mixer": ARRL, agitator, amateur radio operator, bal, bal costume, bal masque, ball, barn dance, beater, blender, bon vivant, cement mixer, churn, clubman, clubwoman, console, control desk, control engineer, control panel, country dance, crucible, dance, eggbeater, emulsifier, excellent companion, fancy-dress ball, good company, good mixer, ham, hop, jack field, joiner, man-about-town, mask, masked ball, masque, masquerade, masquerade ball, master control desk, melting pot, monitor, nightclub habitue, playboy, pleasant company, prom, promenade, radio electrician, radio engineer, radio operator, radio technician, radioman, radiotelegrapher, radiotrician, record hop, shindig, shindy, social lion, square dance, stag dance, tea dance, the dansant
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