Algo – Algorithm
AM – Affiliate Marketing/Manager
AT – Anchor Text
BH – Black Hat
BL – Back link
CDN – Content Delivery Network
CF – Content Foundry
CP – Copy Paste (Panda Test)
CPA – Cost Per Action
CPC – Cost Per Click
CPM – Cost Per Thousand Impressions
CRO – Conversion Rate Optimization
CTR – Click Thru Rate
DA – Domain Authority
DC – Duplicate Content
EMD – Exact Match Domain
EWOQ – Google’s Manual Evaluation of Quality Team
FB – FaceBook
FBN – Fightback Network
G+ – Google+
GA – Google Analytics
GB – Group Buy
GSA – Brand of spam products. Most popular is GSA-SER; a new form of SB.
GWT – Google Webmaster Tools
IBL – Inbound links
IM – Internet Marketing
JBL – Just Build Links
JS – JavaScript
JV – Joint Venture
KW – Keyword
KWT – Keyword Tool (Going away)
LMGTFY – Let Me Google That For You
LP – Landing Page
LRT – Link Research Tools
LV – Link Velocity
Maj – Majestic
MC – Matt Cutts
MFA – Made for AdSense
MS – Money Site
NAP – Name Address Phone
NF – Nofollow
NSEO – Negative SEO
OBL – Outbound links
OP – Original Poster (who started the thread)
OSE – Open Site Explorer
PA – Page Authority (OSE)
PBN – Private Blog Network (for some reason this became the catchphrase in 2014).
PMD – Partial Match Domain
PPC – Pay Per Click
PR – PageRank
RCS – Real Company Shit
SB – Scrapebox
SE – Search Engine
SEM – Search Engine Marketing
SEO – Search Engine Optimization
SERP – Search Engine Results Page
SMO – Social Media Optimization
T1 – Tier 1 (links directly to ranking site)
T2 – Tier 2 (links to tier 1)
TLD – Top Level Domain – Domain Extension .com, .net, etc.
W3TC – W3 Total Cache Plugin
WH – White Hat
WMT – Webmaster Tools
WP – WordPress
XR – Xrumer