The liek comes from a misspelling of like, while the omgz comes from a
weird z-addition of omg which stands for oh my god or oh my gosh. Usually used by people who
slam their heads on the keyboard and cannot spell for
shit, e.g. valleygirls, preppy people who type in sticky caps, or 12-year-olds.
<girl one> liek omgz diz guy spred a rumer abut meh..,,,
<girl
two> omgzzz!111 wut a meenee!!11
<girl one> i nooooooo
<girl two> i no u shud haff sbex wiff his
gf hed get reeel
mad!111 majer paybek
<girl one> wowww liek omgz u r teh so smaert!111 thx babiiiiii