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1.
Heavy, cumbersome breasts that are so large they emit a high pitched squeal.
"Gianna Michaels pig whistles just nearly perforated my ear drums."
by Horrence Bull July 16, 2013
 
2.
Bullshite, useless blather, erroneous beliefs, idiotic statements of the highest degree
Politics is fueled by pigwhistle
by Arual the Wyrd March 14, 2004
 
3.
Interjection used since the 70's as an alternative to swear-words in polite company, also fishwhistle and bogwhistle.
Upon striking thumb accidentally with hammer : 'Pigwhistle !! The bleeding nail moved !!'
by Tom Pearce August 16, 2005