According to the Bible, there are at least two types of mockers and neither is properly defined in a secular dictionary. 
For example the typical definition of a mocker is:
To treat with ridicule or contempt; deride. To mimic, as in sport or derision. See Synonyms at ridicule. (Free Online Dictionary)
The Mocker In Proverbs
Proverbs mentions various types of people and their characteristics. When we come to the mocker in Prov. 22:10 we read:
Drive out the mocker, and out goes strife; quarrels and insults are ended.
Much more is mentioned here:
The proud and arrogant man — “Mocker” is his name; he behaves with overweening pride. (Prov 21:24)
A mocker resents correction; he will not consult the wise. (Prov 15:12)
Do not rebuke a mocker or he will hate you; rebuke a wise man and he will love you. (Prov 9:8)
The mocker of Proverbs is:
- contentious,
- quarrelsome,
- insulting,
- proud and arrogant,
- resents corrections,
- doesn’t consult the wise,
- becomes hateful when rebuked.
The Mocker In Galatians
The mocker in the Book of Galatians attempts to mock God! He tries to mock God by thinking he will reap eternal life, instead of destruction, even though he is sowing to please his sinful nature:
Do not be deceived: God cannot be mocked. A man reaps what he sows.
The one who sows to please his sinful nature, from that nature will reap destruction; the one who sows to please the Spirit, from the Spirit will reap eternal life. Let us not become weary in doing good, for at the proper time we will reap a harvest if we do not give up. (Gal 6:7-9)
Gal. 6:8,9 is a salvation passage few know about and it clearly reveals the once saved always saved proponents as mockers! Such people actually think they can commit adultery, lie, steal, get drunk, swindle, etc. and still reap eternal life in the end because they were once saved. ALL eternal security advocates indirectly state this when they describe their twisted version of the sin unto death. As bad as it is to be the type of mocker described in Proverbs, the attempted God mocker seems to be worse and in our day is directly linked to the false gospel of eternal security and those deceived by it.
