Plex is an adjective used to describe someone to have the physique of a potato.
But this has a second meaning, that it could also be used to describe a brilliant mind that is com"Plec"ated the change of the current into x is a reference to all the exes of youtubers origining from 2010-2018
"Oh my Lord look at here she is such a Plex (laughs)"
Plex: 1) is the mannerisms that are physically displayed when one is about to engage in combat(was referring to hand to hand but applies everywhere).
2) to be doing something 100% in order to make statements in a social fashon.
Notably the song "Got Beef?" by the Eastsidaz sparked Houstonians to begin quoting "Got Plex?" in-line with the long-running of the "Got Milk?" ad campaign of the 90's-2000's. But Plex has been used as slang in Houston for decades and usually refers to aggravated beef from twisted lies.
Plex is short for perplex/complex. Meaning to confuse things. Its slightly different to beefing, as it generally means someone has started rumors, or is confusing fact and fiction, leading to agitation and a running grudge.
"N*ggas got plex? Well I got TECs, the f*ggot" - Big Pic dissing Slim Thug in 2002
"Squash all that plexin" - Northside response to Southside plex in the late 90's