This is a portemanteau:
That is, a large suitcase or trunk that usually opens into two separate parts.
However, the word “mansplaining” is also a portemanteau:
According the Merriam-Webster, 1: a large suitcase; 2: a word or morpheme whose form and meaning are derived from a blending of two or more distinct forms.
Our language has many portemanteaus, including: brunch, dramedy, carjack, Reaganomics, motel, snowmageddon, threepeat, gaydar, Brexit, sharknado, etc.
FUN FACT: “Chortle” is a portemanteau invented by Lewis Carroll, combining “chuckle” and “snort.