kinda like what the other guy put, but in bmx, someone dials something in, ie building a wheel, they are dialling it in, it becomes dialled, same with tricks. can also be used for just about anything
"so you met that girl last night?" "yeah, i dialled her in"
"damn, jakes got that html thing on myspace dialled" "thats because he nibbles it far too much"
"tweaker steves got that line at the trails dialled"