Top 50 Internet Acronyms Parents Need to Know:

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[Ingtar]

I 1
love 4
you 3

[MHGinTN]

Um could those be ‘threesome’ and ‘a lewinsky’?

[BreitbartSentMe]

IIRC, 143 meaning “I love you” comes from the number of letters in each word, and came to common knowledge via Nick & Danielle, a couple of the last installment of Big Brother.

[PGR88]

In the future, not only will our attention spans shorten to the that of a squirrel’s, we will also lose our ability to comprehend complex language.

[Ingtar]

459 are the numbers on the phone pad for ILY
458 are the numbers on the phone pad for ILU

[bert]

IBTZ is one that is rather cryptic

[GOP_Proud]

Well, I see “kitty” hasn’t strayed far from my generation’s slang.

[AmericanMade1776]

so what does 693 mean

[free_for_now]

143 ... I has one letter love has 4 you has 3

[libh8er]

$750 Billion for education. For this ??

[sionnsar]

However, can someone explain the source of 143 and 459 as meaning "I love you"?

143: I for thee?

[sionnsar]

OK. Too old for this

[AlGone2001]

“However, can someone explain the source of 143 and 459 as meaning “I love you”?”

I think the 143 is based on this:

I = 1 letter
love = 4 letters
you = 3 letters

[AFreeBird]

Here's one from back in the mid to late 90's on AOL.

SNERT

Sexually Naive Egotistical Repugnant Teenager

We used to use those a lot. :)

[april15Bendovr]

Learning The Language of the Internet: LMK, IMO, DNO, and more...

http://www.coachmaria.com/articles/acronyms.html

[edcoil]

SWSSTKES

On the back of snamil.

[mamelukesabre]

OK, what’s snamil? And what’s swsstkes? swissteaks?

[GSWarrior]

Is this the pot smoking section at Fenway?

[edcoil]

snamil is snail mail: ie normal mail

Sealed With Sufficient Spit To Keep Envelope Shut

[Mark]

If the parent hears “DU web site”, bring out the belt!