look up any word, like muddin:
 
2.
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
by zooeystar June 04, 2009
 
1.
an abundance of pubic hair in the general vicinity of a woman's sex organs. "retro" refers to the fact that clean shaven puss is the current dominant grooming style
Retro bush keeps it real, man!
by The Master January 23, 2004