年纪大了，年轻人说话听不懂了？不用着急，来看看Urban Dictionary吧。Gotta run, word out

20 Footer:
When a girl looks good from 20 feet away, but when you get close to her shes not.
Guy: Yo man check that bitch up there she looks hot.
..a few seconds later..
Other Guy: Ahhh fuck no dude she aint hot.
Guy: Bitch was a 20 footer dawg.
Other Guy: Yeaa wooordd.