Pubic hair (male or female) that is deliberately or indeliberately grown out, that has qualities defining the pube fashions of past history.
Holy Shit! That must be the fattest 70's retrobush I have ever seen. It must have taken ages to grow...
see also: retroboner
An erection resulting from the experience of some aspect of retro culture (1920's-1990's, currently).
Man, that chick's hair is giving me a retroboner.
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