A portmanteau, for those unfamiliar with the term, is a new word that is obtained by smashing two familiar words together so that their meanings get combined. Many portmanteaus have now passed into regular usage and we no longer think of them as such. Examples are spork (spoon+fork), brunch (breakfast+lunch), motel (motor+hotel), malware (malicious+software), and frenemy (friend+enemy). For more examples, see here.
‘Portmanteau’ (meaning a large suitcase that opens up into two halves) is itself a portmanteau made up of two French words ‘porter’ (to carry) and ‘manteau’ (a cloak).
Some portmanteaus have an ephemeral existence because their lifetimes are clearly limited. Examples are Brangelina and Bennifer that have been coined for celebrity couples.
Journalists tend to try to insert portmanteaus into usage to liven their reporting and they sometimes seem forced because the combined meaning is not obvious. For example, I recently heard on the news someone using the word ‘vibecession‘. This is a portmanteau of the words ‘vibes’ and ‘recession’ and “refers to a disconnect between the economy of a country and the general public’s negative perception of it, which is mostly pessimistic.”
I find other portmanteaus to be too cute or ugly or unnecessary. Examples are ‘snowmageddon’ (snow+Armageddon to denote a massive snowstorm), ‘staycation’ (stay+vacation to denote spending your vacation at home), and the one I hate the most ‘bleisure’ (business+leisure to denote travel that is done for both business and leisure)
Language is dynamic and grows with the addition of new words and giving new meaning to old ones. The staying power of any new word or phrase is determined by how many people find it appealing and start using it. No single person’s opinions matter but there are some portmanteaus that I find grating and hope will disappear.