Top definition
Old School Must Listen - a way of saying these are the founding fathers of the music you listen to today and that you should give them a listen to see where it came from
jef: lil wayne iz so siiik
tom: tupac is OSML

geoff: blink182 r soo rad
thom: sex pistol are OSML
by dangerousPINK June 16, 2012
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