TTL
TTL has 3 meanings
Time to live
In computing, TTL stands for "time to live." Data packets sent within a network typically have a prescribed TTL, which limits how many locations the packet can travel to before being discarded.
For example, if a packet has a TTL of three, it can be sent to three locations before being discarded. This prevents the packet from being sent through the network in an endless loop, tying up resources.
Techies sometimes refer to TTL as a "hop limit," since it limits how many locations a data packet can "hop" to. In some cases, however, a packet's TTL may be an actual time-based limit (such as 300 seconds), instead of a hop-based limit.
Example
What is the TTL for packets on that network?
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When you believe it's time to leave a place or end a conversation you may send TTL. It is commonly used in text messages and online in email or when chatting.
Some people may think that TTL is a rude and abrupt way to end communication with others but it is useful when crunched for time. Be careful who you use it with because it may make them mad.
TTL is one of many ways to say goodbye online and in text messages. Other examples include G2G, BB, BFN, gb, Toodles, TTYL, LUB, and CUL.