A term used to categorize a female of substantial size and weight. Unlike your standard run of the mill fat girl, Beefers avoid whale-status by engaging in minor physical activities such as running on the treadmill in ten minute intervals, erotically dancing at frat parties, and vigorously waving their arms as they bitch about their relationships (or lack thereof). Beefers travel in herds (also known as beef stampedes) and can reduce a solid B+ party to a C- in as little time as it takes to fit them all through the front door.
Rob: Hey man, is that party worth stopping by for?
Steve: Hell yeah man, theres so much booze its redic- ....Wait, fuck, nevermind a beef stampede just rolled through. Beefers on beefers in this bitch now. FUCK!
Rob: Be there in ten.
These are not just regular fat kids. They are fat, athletic men on the offensive line who can turn and run at any moment, skip pull and ram with the utmost efficiency, and rub a little nasty on their opponent (i.e. Tea-bag). Some may call beefers by another alias which is willmanites. The select few in this brotherhood are joined together by one name, the Beefer Nation. The 2008 offensive linemen for the Permian high school football team are the original founders of the Beefer Nation, and therefore have the privilege to elect other people as beefers.
Man did you see all those beefers?!....No those are justfat kids...