npaa

Means "No Problem At All".
Used allot among a group of people on efnet as a reply to "thanks for *".

<lamer> send meh taht mp3 plz
<lamer2> kwilldo
<lamer> kthx
<lamer2> npaa

NPA/NPAA

NPA/NPAA stands for No Problem At All

NPA/NPAA can be used in sentences like

“Hey thanks for cleaning my car”
No problem at all (NPA) or (NPAA) just acts of kindness