1. [mid-19C] a member of the upper classes.
2. [mid-19C] a dying speech on the gallows.
3. [1930s+] (US black) the head; as phr. on top, intelligence.
4. [1950s+] (US Und.) a maximum prison sentence.
5. [1970s+] in a sado-masochistic relationship, the dominant partner [as opposed to a bottom n.3 ].
6. [1980s+] (US drugs) a vial of crack cocaine [different varieties are indicated by the variously coloured plastic tops of the vial].
7. [2010s] (US black) fellatio.
8. see top end under top adj.
[1960s] (US) to go mad.
SE in slang uses
1. [early 19C–1950s] the head; the scalp.
2. the hair.
see under deal v.
[1930s+] (US) from the beginning, at the start; often as take it from the top, to start at the beginning.
[early 18C] (UK Und.) to break into houses using entry via an upper window.
[1920s+] to do something dangerous or remarkable, esp. to get over-excited or angry.
[1980s+] (Aus. prison) to masturbate.
[1900s+] slightly insane.
1. [20C+] taken first, esp. when sharing out money, legally or otherwise, e.g. expenses come off the top.
2. [1990s+] (US) from the beginning, immediately [musical imagery, one reads a score from the top].
1. [1960s+] beyond the usual bounds of taste, behaviour, credibility etc.
2. in attr. use of sense 1.
3. [1980s+] very drunk.
[20C+] the best, the ultimate.
[20C+] (bingo) the number 90, 99 or 100.
see joint n. (4c)
1. [late 18C+] upper-class, superior, aristocratic.
2. in a superior position; the best of a type.
[1950s+] (Aus.) first-rate, in first place; thus the leader, the one in charge.
[1930s–40s] (UK Und.) a cat burglar.