Correct spelling, explanation: having is a present participle/gerund of the infinitive to have. If we want to make a derivative of the verb, we add the regular -ing suffix to the end of it, but the process is slightly different when a verb ends with -e letter. Two vowels (-e and -i) shouldn’t be next to each other, so the -e must disappear. That’s why the correct form is having, not haveing.

Definition of having:
verb, to possess, own, or hold
He is having a sandwich triangle.
For a moment I thought I was having hallucinations.

Collocations with having:
Some most commonly used collocations include:
1. Having fun: enjoying oneself, engaging in enjoyable activities
We spent the afternoon at the amusement park, having fun on the rides.
2. Having a good time: enjoying oneself, having a pleasant experience
I’m really glad we went to that concert last night – we had a great time!
3. Having trouble: experiencing difficulties, encountering problems
She’s been having trouble with her computer all week – she might need to get it repaired.

Incorrect spelling, explanation: haveing is just a misspell because two vowels can’t occur alongside each other in the word. If we want to create a correct form, we should replace -e letter with -i letter and then add the ending -ing, thus we get the word having, not haveing. Remember that -e in have is silent.

Incorrect spelling

Incorrect spelling

Incorrect spelling