It’s not clearly defined, but it goes from: narrowly, the howling that Tex Avery’s wolf character does when he sees an attractive female to, more generally any equivalent reaction: whistling, clapping, openly appreciative remark.
Practitioners generally describe it as a positive reaction; feminists see it as sexist and objectifying, up classify it as sexual aggression.
Practitioners generally describe it as a positive reaction; feminists see it as sexist and objectifying, up classify it as sexual aggression.