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1.
Movie catchphrase/tongue-twister made famous by Arnold Schwarzenegger in the 1993 action parody film Last Action Hero. Meant to make fun of typical catchphrases that made action films even more remarkable in the first place, which Arnold himself is well known for.

However, it never caught on when compared to "I'll be back" (also spoofed in Last Action Hero), "Hasta la vista, baby" or "Get to the chopper", which will always be Arnold's top catch phrases.
Jack Slater: You've seen these movies where they say "Make my day" or "I'm your worst nightmare"? Well, listen to this one: Rubber baby buggy bumpers!
by Mucking Fagnets January 30, 2011
 
2.
A tongue twister that dates back to at least the 1960s in the United States.
Jayden attempted to say the tongue twister "Rubber Baby Buggy Bumpers," but his state of inebriation was such that all he could manage was "Rubba Ba........ fuck that!"
by Historymike April 13, 2013
 
3.
A synonym for boobs or breasts as used by Robert Lund in "99 Words for Boobs".
"Man, I want to take those rubber baby buggy bumpers for a ride."
by C Weiss March 29, 2008