How could you not get that one!?
Here's the explanation!
A person in disguise who tells nought but lies and holds sercrets : SPY
The last thind to menD, the miDDle of miDDle and the enD of enD: D
What do you say besides um and swear words when you've lost your train of thought? : ER
Now, put them together and you've got a creature you'd hate to kiss: SPIDER!!!