Other new words include "janky", meaning "poor quality", "pumpkin spice", referring to the popular Starbucks drink, and "own", which means "to dominate and defeat".
In an online post explaining its process for selecting new words, the publisher said, "The dictionary chronicles how the language grows and changes, which means new words and definitions must continually be added.
"When many people use a word in the same way, over a long enough period of time, that word becomes eligible for inclusion."
Some of these words might seem like they're relatively new to the English language, while some of them have been used for years.
For example, the newly-entered verb "MacGyver", has been used for years to mean fixing or making something with whatever tools are available, just like the main character of the 1980s television show.
And "pumpkin spice", now officially a noun, refers to "a blend of cinnamon, nutmeg, ginger, cloves and allspice," first used in a popular Starbucks flavour in the US. Over the years this particular spice mix has been added to everything from desserts to hummus.
Several online dictionary users welcomed the new additions.
"This Vermonter who is EXTREMELY familiar with mud season is thrilled you added 'mud season' to the dictionary," one tweeted in response.
Another social media user cracked a joke in response to the addition of new word "laggy", meaning "having a delayed or slow response".
They wrote, "It's about ... wait for it ... time."
