has a wiki that states:
"Pull my finger is a joke or prank regarding flatulence in which a victim is asked to pull the finger of the joker, who simultaneously breaks wind so as to suggest a causal relationship between the two events.
A comparable activity is attributed to a character in a short story by Mordecai Richler (collected in The Street, 1969):
He settled in sullenly at the kitchen table, his smile morose, and suddenly he would call out, "Pull my finger!" If you did he let out a tremendous burp.
A variation on this joke appears in Yasujirō Ozu's film Good Morning (1959). Schoolboys ask each other to push their foreheads, responding with an expulsion of gas."
...but doesn't affiliate it with a national origin. I'm not opposed to letting the aussies claim this one. Go Roos!
RE: Splinterlands 101 - Ep 33: Behind The Avatar @k-o-m-c